KeepKey may also support NEM and have similar features as Trezor because it was released that it has the updated protocol to keep compatibility with Trezor. For more details, please see: https://www.keepkey.com/2016/02/17/release-notes-for-firmware-1-0-4-proxy-0-3-7-wallet-0-3-6/

I guess to get to know the firmware specifics you'll need to contact them directly via email.