2a Yes It is safe to reset your Trezor wallet (and recover it afterwards) - because when the same recovery seed is used and the same passphrase is entered (if enabled and used), the same wallet is accessed. There is no exception. It always generates the same wallet including the same accounts having the same addresses in the same order. The public-key cryptography ensures it generates always the same result.
However this doesn’t really resolve your issue with recovery seed being potentially compromised (as the recovery seed will remain the same when you wipe and recover your wallet).
2b It is important to distinguish between resetting/wiping your device and creating new wallet and recovering the old one:
If you wipe your device it will delete all data associated with the pre-existing accounts (your recovery seed) and settings associated with the device, such as the PIN.
Apart from that you can also proceed to factory reset which will erase everything on your device except bootloader. (so this will delete firmware as well).
After each of previously mentioned processes you will have an option to either create new wallet or recover already existing one.
So in case that your recovery seed would be compromised but your passphrase would remain safe your funds are still safe as well! However potential attackers would be already “half way there” (even though the second half of breaking into your wallet could still be almost impossible as the passphrase would exist ideally only in your head). But security best practice would be to transfer your funds to a newly created wallet (fresh recovery seed) and hidden wallet (same or different passphrase).
Note that in general to make such transfer you always have to use right combination of recovery seed and passphrase (if enabled and used) in order to be able to sign the transaction:
When first initialized, a Trezor device generates a random number which is converted into a mnemonic sentence (recovery seed) and stored in the memory. Subsequently, whenever the device is used, it derives a cryptocurrency wallet from a magical formula;
mnemonic+passphrase (extremely simplified).
If you do not input any passphrase (default setting), an empty string is used. When the feature is activated, you will be prompted to enter the passphrase which is then combined with the recovery seed on the device, and a new wallet is generated (and you would need to use this sort of “formula” - combination of recovery seed and passphrase - every time you want to make a transaction.