I could kind of see how it could be done. I actually wanted to build something like this but Big Bore Bart did it. I just don't see anything on the picture how you would control the shot count, like a power adjuster. I guess you wouldn't be dumping all the air to get three consecutive shots and you would be pushing 860fps on the one full power shot.
It would make more sense to have these features starting with the 2260 platform and a modified 2100 pump tube, better yet, scavenge the legacy 1000 pump components. So,tear up two guns to make one, including some added parts.