Here's an idea. Bare with me, it's pretty out there.
SCS devs give the TMP devs the release version 1-4 weeks ahead of the actual release. Both dev teams agree on a deadline so when ETS2 has a big update, TMP updates alongside it. Best part? Nobody would be the wiser for the delay because SCS announced the release would be X day which is when TMP has its release ready, too!