Yeah, that starts with PR #2. I keep starting down that rabbit trail unintentionally and before I realize it project creep is happening and I'm blowing my budget for this whole thing on just the receiver.
What I'm finding says no. It appears they physically fit the action but putting the action back in the stock or getting it to work right if it does go back without altering the stock are another story.
That is an excellent idea! .223AI was briefly discussed in another thread and I was sort of looking for a reason to go that way.