But I think, that it should be wise to drop "Bits Of Proof" if that's the "so called backend" and replace it with something more decent, perhaps "chain.com" can be a contender?
Unfortunately no other blockchain explorers understand BIP32 ...
Bits of Proof delivered a software without not a single TREZOR would have been useful or sold until now.
It supports your technology just as you wished for. It serves hundreds of your customer in every moment for more than a half a year.
You could be regarded fortunate having such a partner. Unfortunately you do not see it.