Actually, we do have since recently a yet undocumented feature to allow for such.
In a file you can specify a list of plug-ins that you want Dorico to ignore, so they don’t get scanned or displayed in the plug-in selection drop down list.
The implementation on the audio engine side is already in place, it just needs a nice GUI on Dorico side in order that you can nicely create such ignore list.
I can send you a script which creates an ignore list with all of your plug-ins. You then can load it into a text editor and prune it out, i.e. delete entries for the plug-ins that you want to see/use in Dorico.