Hi, have you considered accepting Tether through the Trc20 chain?
Here’s my attempt to answer:
Sovryn is a smart contract system built on RSK. Currently I believe the only USDT on RSK comes over a bridge from Ethereum. If you want to use USDT from Tron, you would have to build a bridge from Tron to RSK.
Does that answer your question @Martian?