Adapters are cheap and exist. Some sort of adjustable PV-sized chuck would be significantly more expensive than a simple adapter and does not currently exist. An adjustable adapter would also be larger, heavier, and more likely to break than the existing options. People aren't opposed to the idea because of some weird conspiracy, they're opposed to it because it's not a good idea.
Please reread what I posted. In fact, such a thing does exist. It just got buried in complaints from people saying it wasn't worthwhile buy an adapter, it won't work buy an adapter, adapters are cheap so buy an adapter, etc. even tho it was documented as being functional in theory and working splendidly with a 510. Of course, those objections were just their opinions.... and I DO note the periodic call from those who do, in fact, have an interest in just such a thing. I had such an interest myself until making the leap to a permanent atty design.
Adapters are irrelevant to me now.
So.... even tho the idea of a multiadapter is not a "good idea" in your opinion, as well as others, people keep asking for one. Hmmmm... why object to someone trying to find a new way? Must everyone conform to the accepted truth that they should "buy an adapter"?
Poppycock! Pigswallow, I say!