When considering AC, it should also be factored in that bracers of defense are a no brainer and practically standard issue on monks, so your actual AC would be 20+.
You are right, if Larian won't be homebrewing items too much and include some staples - then this can fix AC just fine. Speaking of items, I bet there will also be more magical Greatswords and Armors in the final game which can spike the power of an armored STR monk as well.
If you are worried about attributes though, are you opposed to just rolling your stats? It’s been stated several times that this feature will be in the final game.
If the option is present, I'll very likely go for it.
There was no confirmation yet, I am looking forwards to the PFH for getting this info.