Unless of course you have one of the reputable members from the forum in your group acting as the primary escrow, then I doubt that anyone is going to use your discord service. It's basically the same as sending someone that you don't know a large sum of money over the internet.
Anyone reading this thread and wanting to find a legit escrow, I recommend using someone on the forum that has dark green trust and has escrowed previously lots of funds for projects and individuals. Don't just find some random guy and tell him to escrow funds for you.
I use discord from time to time but I just don't see it as way for doing escrows even as an alternative . How will you prove to your clients that those testimonials are true? since from what I know discord doesn't even have a feedback system or anything that is made specifically for trades.
But yes as mentioned above, it's another story if the trusted escrows are from here. You can just link their profiles there, sign a message etc... and also feature "quick trades" as one of your selling point given that you're in a group chat because unplanned trades which requires an escrow in the nearest time are always there but this requires your agents to be active most of the time .