You can use Vetwrap to wrap the hooves for traction on indoor surfaces; just be sure to keep it only on the hooves; don't wrap above the hairline at the coronet-and don't stretch it TOO tight when wrapping.
I have a set of the 'pony' sized 'classic/original' Easyboots. They fit my B sized mini pretty well, though she did 'throw' one once on a brisk trot down the unpaved gravel road I live on. Got 'gaiters' with the newer pair I got, which should prevent actually 'losing' one.I have an idea in my head to use an old mouse pad to make some inner 'pads' for them,to help get a better 'stay-on', and cushion the soles even more. Considering cutting the pads 'sole' size, not 'wall-to-wall', but haven't decided that yet.