PayBis looks more suitable for fiat trading. Do you have any idea If it will be possible to trade to PayPal, PerfectMoney and the other methods they support as well?
Short answer: Currently, it is not possible.
I have just checked it with my TREZOR T and that is how the "Exchange" menu looks like.

As you can see on the picture above, you can exchange your BTC to BCH, BTG, DASH, DOGE, ETH, ETC, LTC, XMR, XRP, ZEC or buy some directly from the latest TREZOR beta wallet. Since it is available only in the beta release of the wallet, they might consider adding sell option in the future. It is worth to mention that TREZOR warns user that these are third party services which are not associated with them.
Also, Monero and some other coins will be supported in the upcoming TREZOR T software update. Some code changes need to be merged into Monero.