I think that would not fly in most parishes here. The only place I've seen it done was college chapel, where morning prayer flowed straight into the Eucharist. And even then, it only worked because for ordinands attendance at morning prayer was compulsory, the Eucharist optional; but by the time we were in situ it was rare for any of us to leave halfway through.
It is critical to control the length of the services. 1662 Anglican Morning Prayer takes 30 minutes without singing, and might be singable in 30 minutes, and a said service of Holy Communion can be done in 35 minutes.
Conveniently enough, morning and evening prayer in Rev. John Hunter’s Devotional Services are shorter, and The Matins I presently use takes an average of 20 minutes, and the main service takes an average of 50 minutes, 15 of which is theoretically due to my homily.* The Vespers I use on Sunday takes a reliable 20 minutes, because it consists of Phos Hilarion being sung followed by a Lucenarium, a reading of the Old Testament and the Magnificat. The main service tends to be 50 minutes also, and Compline takes 10 minutes, or 15 if I read a metrical homily. And some people arrive late and leave early. This is also the case in Orthodox churches. By the way, should you doubt the accuracy of my timing, look at the videos by the Prayer Book Society, or the recordings of Choral Vespers on the BBC.
Another key element is the services have to be seamless. So you don’t stop and say “We’re going to start the Holy Communion now,” or do anything to indicate one has ended and another has begun; there are dismissals in the liturgical texts, but these have to be read as if they are blessings. You’re a big fan, like me, of Sergei Rachmaninoff’s All Night Vigils, but did you know the music and litanies contained therein span Vespers, Compline, The Midnight Office, Matins, and Prime? All of those get abbreviated to the bare minimum; Rachmaninoff’s musical setting is a further abbreviation; usually the actual service is 90 minutes.
Perhaps? The first parish I worked in after I was ordained had morning prayer five mornings a week, and a decent little group who met to pray together and then chatted over coffee. In their case, it worked because of proximity to a university, and academics and students had the flexibility to be in church at 8:30am.
What made that work was you had them daily at a sane time. My failure was to have it only once a week, and at an inconvenient time (mid afternoon). Whoops.
But indeed, if you get a group of people in the church at the same time daily, that is known to work reliably, but it has to be a convenient time, like 8:30, and not when everyone is either at work or picking their kids up from school, on one day a week. When I moved the service back to 4:30 I got some attendees, but then we (my senior pastor and I) decided on an alternate schedule for midweek services which worked better. And then two years later he announced his retirement, and I decided to leave, because the pleasure of working with a good colleague is all that was keeping me in that denomination by that point. I nearly resigned a few years earlier over “Commagate”
But - with four churches to look after - what I notice where I am now, is that the services which are morning prayer (because the priest is in one of the other four churches) show a marked drop in attendance.
I would expect this, because I know a number of Orthodox clergy who are responsible for multiple parishes, and whenever they are absent, something called the Typika, which is basically Ante Communion, is served instead (as it can be done with a reader or no clergy at all). Although I would be interested to know if Ante Communion is not allowed without a priest? Also, the old BCP has rubrics that allow Mattins to be used in lieu of Ante-Communion; I wonder what would happen if you used that. I haven’t yet bought your BCP because I forgot what color to get, embarassingly, so I am just going off of the 1662, where Ante Communion and Mattins are pretty radically different.
But even if they were the same, the lack of communion or another compelling sacrament will cause reduced attendance. Its not just the lack of communion that causes Typika services or the Mattins held in your absence to have lower attendance - it is also your absence. People want to hear
you preach; the fact that they stuck around after you were installed is a good sign they like you, and you are certainly missed in those places where you served previously. Even in the case of the Orthodox and Latin Rite Catholic communities, where priests often try to avoid differentiating themselves from their colleagues so as to be interchangeable, people still get attached to them, and at a minimum, they want a priest, preferably
their priest.
* I theoretically preach for 15 minutes, but that’s the maximum; I record myself and time myself so as to make sure the entire service fits into the desired ranges.. I don’t hate preaching, I enjoy it, but other aspects of the service can be just as edifying,