What we are working right now is to integrate TREZOR into multisig wallets such as Copay and this should be ready soon(tm).
Are you still having problems finding wallet developers that provide full node network access (for xpub privacy)? It seems like I can get really secure Bitcoins using a Trezor, as long as I don't mind trusting wallet service x's nodes with full account details. I really don't like the latter part, however good the former is.
I suppose a workaround is to treat Trezor accounts as dispensable in the same way that ordinary addresses are. There's no upper limit on the amount of accounts that a single xpub can generate, right?
I think your only option is to wait for Armory to support Trezor as they have promised to do. Bitcoin Core might but they move slower than Armory.