I would suggest hacksawing the reel seat in a spiral and then "peeling" it off. Some heat may be required to soften the bonding agent/glue.
Obviously, you would have to remove the bottom handle but, as the taper is relatively steady at this point on most blanks, a new one could be made, reamed and slid on from the bottom of the blank.
I have not tried this myself but did put the same question to a rod builder of considerable experience and that was the answer he gave to me. I'm thinking about doing the same to two rods that I own. One is a badly balanced single hander that I think would make an ideal switch/short spey rod(11ft). So I'll have to strip the whole handle and probably the stripper guide off it.
If I get round to it soon, I'll let you know how I get on.