I've got searches for 1/24 figures on eBay, and there are driver figures out there, but most are race car drivers.  I don't know if that would fit into what you want.

Here's one, for example, which probably came from a 1/24 kit:  https://www.ebay.com/itm/265706212467?hash=item3ddd530c73:g:WCkAAOSwmt9g09lp

This ICM set was interesting, a pair of historical drivers, circa 1900:  https://www.ebay.com/itm/354071753575?hash=item5270523367:g:qwcAAOSwXWxidt3z

Like you've found, most figures are people doing things near a vehicle, not driving it.

Fujimi put out this set, back in the 70s, I think, and it comes up on eBay every so often.  This is an auction from a seller in the Netherlands:   https://www.ebay.com/itm/283726151372?hash=item420f657ecc:g:C0gAAOSwtCNeCMgp

Again, you might go for this, but it gives you an idea of what's available, and depending on how long you can wait, you might find it from another seller.