Beautiful Betta, I must put a photo of my new one oh the forium!
The babualti shrimp may be safer with a betta as they are green so not quite so obvious, though I'm still sure the betta will eat any baby shrimps if he gets the chance? And even if he doesn't eat the shrimps now, he may start later on, so you will need to keep a perminant check on him, and your shrimps. The babaulti will be fine with the red cherry shrimps if that happens as the 2 don't crossbreed! And of course, when you start getting wild type cherry babies (usually clear or brown) you can happily dump them in with the betta, as I did, either as live food, or if the betta doesn't eat them, clean up crew - either way is a win?
You may have to wait a while to get the shrimps of coarse with us now on full lockdown again......... but that suits your plan anyway I guess, luckily? Are you a ProShrimp customer?
Simon