I wouldn't see why not. Force is kind of like the "king" of all energy types. Hurts incorporeal creatures, bypasses DR, and there are no resistances to it, however no one is especially vulnerable except incorporeal creatures.....
"You may replace a spell’s normal damage with that energy type or split the spell’s damage"
it seems like the answer is afirmative.It says the normal damage, so if the spell do damage (of any type) then the damage can be converted to elemntal damage.
I've seen a GM allow Force as a energy type, it swiftly unbalanced the game.
Force is very specifically its own special type of damage, not an energy type. No variable energy-related spell or magic item names Force.
I've gone down this path; as tempting as it seems, don't go.