There is no easy way to convert a Trezor seed into a 25 word native monero seed that I know of. It would be great to not need a Trezor Model T to access my monero in an emergency.
Monero recovery is pretty tricky, but if you have Linux or MacOS, you can use our Trezor emulator: https://docs.trezor.io/trezor-firmware/core/emulator/index.html
You can also find some additional tips in this thread: https://github.com/trezor/trezor-firmware/issues/1078
I must mention that these tools are dedicated to advanced users, though. However, as a prevention we suggest having another Trezor device as a backup.