you can use electrum offline with your Trezor
Yes, thanks. I've just confirmed that.
However, it may be quite complicated if the trezor firmware updates and then is out of sync with the electrum connection software on the offline machine. Updating and keeping all in sync may become a pain and possibly risky.
Maybe I'm too paranoid. Jumping through so many hoops to get the ultimate security and you lose the coins through complexity.
Btw. I have since found the offline cold storage electrum - trezor does work
It works with the online watch only electrum wallet created with master public keys from electrum and linked to trezor as cosigner. Then when you spend from that watch wallet, the trezor signs, you save txn to usb disk, goto offline cold storage electrum-trezor wallet, connect trezor to that , load transaction, it will ask to login to trezor with pin, sign txn on electrum, save to usb, insert usb on watch wallet machine, load and broadcast txn.
All fine as long as you dont have firmware upgrade incompatibilities