Well,
After 13 years on this forum, and 20 years working with arcade games i will figure it out. I have never worked with driving games before and was hoping for some help coming up with an inexpensive and workable solution, i mean this is not the KLOV forums after all! Let me ask this, how does the steering wheel control and the pedal control interface with the original board? What is the difference between what the wheel sends for data to the original board vs Mame?
It sounds like the best option for you is to build it yourself and see if anything works for you. I did. I built a cabinet called Prepare to Quality and it's in my signature if you want to read my trials. Ultimately I sold it because at first, like you, I thought there wasn't much to a driving game. Only once I dug in did I learn that the carbinet I created, only played a couple arcade games perfect, and everything else was a compromise. In my arcade, kids and many adults gravitated towards the driving machine. I mean, afterall, who doesn't love a steering wheel and pedals? But, it required the most instruction for guests. I had to tell people "Make sure to select automatic" and "let the shifter return to center to shift from high to low".
The reason you don't see a multi-cart driving game options is the same reason. There is no single hardware solution for many of the mame arcade driving games.
For you, you could find the cabinet very playable, but for me and for many people trying to share their advice with you in this thread, it's too much of a sacrifice.