No idea if this will work, but this little gem in GCTech.TECH offers a suggestion:
//------------------------------------------------------------------------
TECH 999 ImpossibleTech
//------------------------------------------------------------------------
Name "Impossible Tech"
Model ""
Tech_Requirement "ImpossibleTech"
Research_Cost 55000
Overview "If you're seeing this it means you're looking at this tech file. Naughty naughty."
Description "This tech is impossible to research. So we use it as the requirement for one time units."
Tech_Category 4
ENDTECH
So try changing final frontier to this:
//------------------------------------------------------------------------
TECH 89 FinalFrontier
//------------------------------------------------------------------------
Name "Final Frontier"
Model ""
Tech_Requirement "999"
That may prevent you from ever being able to research it... it may also cause the game to crap out, your car to break down, your wife to leave you, the sun to implode and/or releasing an evil force called Draginol from dark stasis. LOL
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