Mast Splice below the partners???

[HappySailor]

I found a rig that might work for my boat, but it's set up as a deck stepped rig... Whereas the rig I am replacing was keel stepped...

I would like to know the group's thought on using a deck stepped rig as a keel stepped rig by splicing a section just below the partners???

Or If go the other way... Converting to a deck stepped rig with a compression post and associated hull work???

Big rig, 48 ft boat, 72 ft stick...

Thanks for looking!

HS