Hey spiritlight. My thoughts exactly. I doubt you've read through the entire thread, but I've said much the same thing you've said here.
This has led me to the conclusion that trying to do evangelism "at work" or "on the job" at all just isn't worth it and not particularly consistent with what Jesus taught.
In other words, if we have to "be careful with overdoing evangelism" because our employer might be offended by it, then we're probably working for the wrong employer.
I agree.
There is times to talk to people and times not to.
Ecclesiastes 3 came to mind for you.
3 There is a time for everything,
and a season for every activity under the heavens:
2 a time to be born and a time to die,
a time to plant and a time to uproot,
3 a time to kill and a time to heal,
a time to tear down and a time to build,
4 a time to weep and a time to laugh,
a time to mourn and a time to dance,
5 a time to scatter stones and a time to gather them,
a time to embrace and a time to refrain from embracing,
6 a time to search and a time to give up,
a time to keep and a time to throw away,
7 a time to tear and a time to mend,
a time to be silent and a time to speak,
8 a time to love and a time to hate,
a time for war and a time for peace.