Hi David,
I'm also considering replacing the puck to allow for a losmandy style dovetail as per advice given to me by Brendan from these forums. I found this which might be of interest to you:
http://admaccessories.com/D_Series_Saddles.htm
Now I'm trying to do this on the cheap and looked a bit further and found the puck alone for $25 here:
http://admaccessories.com/Miscellaneous_Adapters.htm
and as far as I can tell, I don't see why I need to spend the extra $85 for a saddle when I can direcly attach a dovetail plate to the puck. The puck has 1/4-20 holes spaced 2 inches apart by centre and according to this page:
http://admaccessories.com/D_Series_Universal.htm
there are 2-inch spaced holes every 1.5 inches along these plates. So anyway, my thinking is to buy a $25 and a $65 DUP15 plate and screw the 2 together, since I'm unlikely to have multiple things on different dovetails to need the saddle.
I'd appreciate any input on whether this is feasible or not, having never seen either component. I'm just going based on the descriptions.