Did your ER9 firmware and LTwoo app software update with blip compatibility? Only one of my ER9 groupsets updated, while the other one did not. It your ER9 did update, it's possible you can just get the TT shifters/levers and use your current hardware.
Also I've been cruising Chinese social media (using translation algorithms). The new ERX has already been released over there. They also seem to be referring to the new ERX as the blue edition (or blue print). Interestingly enough they have the same concerns about LTwoo in regards to after sales support, durability and cost value compared to 105 Di2.
I've been doing very little riding, so haven't updated anything in many weeks, because stuff has simply been working. I replaced my RD at the end of the season because it half died, i had a spare, and didnt have the patience to try to figure out the problem (pure case of kicking the can down the road).
Very interesting about the chinese market reporting the same concerns and problems as the west, thank you for that...