Xwing;
Lotta similarities between us, and some substantial differences also. I've been carrying on a motorcycle for decades.
However, though you didn't state what your dominant eye is I'm left/left, and that's a big advantage. I use a tank bag in most cases. If you choose carefully, it's usually pretty easy to either adapt a holster to fit the bag, or sew a homemade one in. Just make sure it's an easily detached bag & carry it with you off the bike. It keeps the gun off your body in the case of putting it flat side down, and that's a serious consideration to me.
I carry an H&K USPc & currently ride an 848EVO. But I haven't found a good bag for it yet. OTOH, I'm in Montana & can easily see that the clothing considerations are markedly different. Which means that so far I've been able to conceal with my normal IWB for short trips. Therefore, I haven't been exactly hotly pursuing all the bag options out there.
If I were your, and normally shooting from the right hand, I'd start putting in a lot of practice with weak hand drills. Remember, all you really want to do is get away from the situation using the acceleration of the bike. Pinpoint accuracy is a dream, and accuracy of any sort is only a lesser dream. You need the right hand for the throttle, just keep the B/G's rattled & leave. Easy to stow the gun back in a bag & use both hands to depart, rapidly.
I don't know of a single range that allows you to practice while riding. And you sure aren't going to develop the skill set to reliably hit while moving through wishin' & hopin'.
900F