MPASM Preprocessor.

I have the following problem (idea..):
Being used to z80/8086 mnemonics I wonder whether there already exist
some sort of preprocessor which would translate 8086 like mnemonics
to Microchip MPASM (which I still have difficulties in understanding).
I am thinking about writing such programme (C, C++) myself but if there
already exist one than why bother.
Having such preprocessor one could expand some exotic mnemonics as macros,
say add some of the recently discussed math examples, etc
Any ideas?

All The Best For The New Year!!

Janusz