For the first one, I would assume that it is indeed possible since your protestant friend was by his baptism incorporated into the Catholic Church even though he doesn't know it.
For the second, the penitential rite can take place outside of Mass. In the current celebration of the Liturgy of the Hours it can be said as part of Compline and a priest does not have to be present. Since mortal sins can technically be remitted by an act of perfect contrition (with intention to confess asap), it would probably be safe to assume venial sins can be remitted by a good act of contrition.
For the second, the penitential rite can take place outside of Mass. In the current celebration of the Liturgy of the Hours it can be said as part of Compline and a priest does not have to be present. Since mortal sins can technically be remitted by an act of perfect contrition (with intention to confess asap), it would probably be safe to assume venial sins can be remitted by a good act of contrition.
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