Yes technically you can have that on one device. But that would require wiping and recovering the wallet every time you want to manage some operation with your funds in the other wallet.
Keep in mind that you can use only one seed on your device at the time.
Since this is the limit of Ronin app and not Trezor I can’t really answer this question. So this would be question rather for SkyMavis support.
Also, please note that since you have recovered the seed that has been generated online by 3rd party app (in this case Ronin) on your Trezor, you have basically stopped using its only purpose: generating and storing your private keys offline (at least when we’re talking about Standard wallet).
So the only added value (in terms of layers of security) would be your Hidden wallets that are protected by passphrase (that is not stored online nor on the device).