If you have enough money in the bank, you can do just about anything. In all honesty, Lefty Dude gave sage advise. Either park the
Bisley in the safe or sell it for whatever you can get for it. The Bisley, for the most part is NOT popular. For most folks, the grip just
does not work.
Without some extensive machine work, a standard Plow Handle grip set will not graft to a Bisley. You would also have to change out the hammer and Mainspring. I'm not positive about the geometry of the Hammer Cam for the Bolt rise as it's been a good while since I
was inside a Colt style Bisley. In addition to a lot of very expensive labor, you'd also have the colt of the new parts. Just on the
basis of the economics, it's a no go.
Just save up yer box tops and get a new gun. You'll actually be way ahead.
Coffinmaker