I've seen where some guys have run the wire for their meat probe through the ferrule that the spit rides on. Then using rubber bands or zip ties, fasten the transmitter of, say, their Maverick, to the handle of spit. It then rotates with the spit and sends the temp to the receiver.
I haven't tried this, myself, yet, but am planning to give it "a whirl" on my next roti cook.
BD