Aye, you'd be better off running something universal like GURPS or using the D20Modern version of the D20 D&D rules. I've got the corebook and urban arcana (some useful feats and classes for universal use, some with slight modification) as PDF files with their WEs integrated and D20 future as a series of Word (.doc) files.
You can use all the SI equipment as examples to write up 'verse-specific items, weapons, and vehicles for the PnP SARP.
Though GURPS will probably be the most flexible, I wouldn't know cause I haven't actually played with the system, but from my passing readings of the Traveller rulebook, it looks like it's pretty expansive and solid.