I went the other way. Capt's to bench. Direct bolt in. You will have some holes in the carpet where the seatbelts went. I had to cut these out in mine.
Most captains chairs won't lay flat like the bench seats. They may recline a good extent, but not as flat at the bench seats.
However, I have seen them with the swivel bases. So you could have the backs of the seats possible a good portion out of the way if you needed to lay some thing in.
The stock ones I do believe lay flat but they do not flip forward IIRC.
But frankly if one were not looking for the full cargo space I think trying to put full size front captains in there would give the best comfort for sitting. Rear seating would by had thru the middle isle space. Then again you could even go for 3 rows of captains chairs; now that would be different and not seen.