It is worth considering 105 Di2 given that there's not a lot of price difference between ER9 and 105 now (maybe 150 EUR or so if buying grey market from AliExpress).
Also consider whether you want a power meter or not. For me, a power meter on a road bike is a non-negotiable, but it depends on whether that data is important to you or not. Crank spider versions are the cheapest, but what's available will depend on your crank choice now.
For the crank, you might as well go DUB rather than 24mm, slightly lighter with no compromises given you're on T47.
And lastly, consider tubeless! Setup on my Tagoola Aeroraptor wheels was very easy with a Pirelli P-Zero RS tyre - seals no trouble with a floor pump. Your Tagoola wheels come pre-taped and tubeless valves are in the box.