Well from what I heard that club races work in lan, so if you have 3 other computers at your house lan, 4 profiles, divided into two clubs, race at the inter-club races. You could try using hamachi, ask 3 other people to help you out doing that but thats unlikely.
You could use hexworkshop to edit out the bits of info, but it would take quite a while, a really really long while.
But hey if you want to go ahead and give a try, here: Hex Workshop: Hex Editor, Sector Editor, Base Converter and Hex Calulator for Windows
The easiest way I see it is to have a donor savegame that's already Ace and transferring info from that savegame to your savegame using hexworkshop, and its actually very easy. That's what I do to my multiple profiles and they're all ace. :p
I could easily help you with it but I don't know if I'm allowed to post it here, sorry.:(
Don't worry I was in the same situation too when I got interested in completing the game, when I was around 90%+ I found out that I couldn't complete it because of the club races, restarted the game from scratch and got ace in 2 weeks or so. :)
It's up to you if its worth it or not.