Great suggestions as usual!
Here is a quick “hack” tip that might serve you in the short term:
The DPS profiles are located in Macintosh HD/Library/Application Support/Bongiovi Acoustics. They appear in the Built-In/Desktop/Headphones menus according to their file name suffix.
So by rearranging where the profiles appear, you can take advantage of the three automatic EQ settings. Perhaps set your Audiolab speakers to _1 so they appear under Built-In, Your Apple standard earbuds to _2 then your Shure SE535s to _3. Then the EQ will be saved for each of those whenever you switch to their “Listening to:” category.
Just a thought 🙂