IIWM, I'd stick with the ADL (no floor plate) model.
You can sell the bottom metal here and/or trade for a 21 buck ADL trigger guard. There always seems to be some one looking for BDL bottom metal.
I also think the mag, follower, etc can be used with the ADL. Stick it in there and see how she goes.
The ADL is reported to be just a bit stiffer than the BDL due to lack of the mag opening. In my book, stiffer is better.
Next you could consider an inline (bench rest follower) for shooting single shot if you should desire. Single shooters are better shots anyway.
Good luck on your decision.