Yep, sadly having read some of the older feature requests (that I should have found before posting this one), it seems like this is something that users have longed for but for one reason or another DxO are reluctant to address… maybe in the “too difficult” pile. For example in this post there are people wondering whether it might be addressed in PL3… and here we are with PL9 and there still isn’t a proper integration with Nik Collection.