Do you have access to a model editing program?
The only way I knew was to import the model remove all the SFC 3 stuff from it. Find a comparable class ship for the race and import the HP and DP, add lods if you have them and export the file.
This is a simplistic look at how to do it but it is the general order of operations.
SFC 1 ships can be used in SFC 2 and OP, they will not have light maps that work though.