I love the idea, and "normally", that's what I'd do, mate. Thank you!
I'll spare you the lengthy tragic story, but long-term illness has meant I've been isolated and not mobile after losing the 5 classy friends I chose to keep from a large "questionable" bunch to bushfire, cancer and suicide. I've not been able to meet the right people (or any really, for that matter)... apart from peeps I help with audio-tech issues in forums and those I've met playing GT6, few of whom reside in my country, let alone nearby.
So, great idea, but alas, without a PC or access to one, it's a no-can-do situation. I can't for the life of me understand why Logitech doesn't simply make a Mac version. Given the simplicity of the app (I assume), you'd think it'd be an afternoon's work for a coder who knew what he was doing.
Nevertheless, given the popularity of the G29, I'm going to assume that PD will increase the level of support for it in terms of adjustability and configurability. To paraphrase Princess Leia, "Polyphony Digital, you're my only hope...".