I am not sure. For very basic editing with vi only a few commands are really necessary. Once you have started you can improve gradually.
One could try to make a small, like a one page A4/letter size, survival guide for vi, based on the biggest stumbling blocks that users new to vi experience. Not cramming most and every conceivable command into that piece of information but centered on the very basic editing commands and curcor movements. I think the aspect of modal editing should be front and center*.
This sounds trivial but I fear it isn't: it means condensing all users' previous attitudes and experiences into such a small space that it would be usefull to all across different learning styles. New individual users probably could, when stumbling again and again on the same stuff, make such a small
individual survival guide by trial and error learning. That presupposes that they do not consult some of the fine tutorials/guides that describe (n)vi(m) in depth. This doesn't mean that they will have to gell with vi as the latest** greatest thing since sliced bread as their editor of choice, or that they would (need to) become proficient with vi; or that they have to like it: just to survive with it.
That said:
if there will be a selection mechanism that selects either vi or another (non-modal) editor and that selection can also be made after installation (also not a trivial task covering for all eventualities), then I would be fine with that.
___
* not particularly explaining what that is in depth but more so explaining what kind of (unexpected) behaviour one can experience in the wrong mode and what to do to get out of that.
** well, ... actually one of the oldest