GC Performance on Youtube did a recent video where he paired an Alugear 1x chainring (on 12 speed 105 cranks) with a 105 di2 rear mech. Said it’s pretty solid. Likewise there are several comments of others who have done the same and claim it works well.
I’m looking at a 1x 105 di2 build using their new 11-36 cassette - just waiting a tad longer to see if Shimano releases GRX 12, in which case I’ll likely choose a GRX crank with Shimano 1x12 chainring, rather than go aftermarket ring on the 105 crank.