Anglo playing spontaneously stimulates more use of bellows articulation particularly for staccato

I don't agree. Bellows reversals do not achieve staccato, merely that one note stops when the next one starts, which isn't the same thing. I always recommend my students to practice staccato by quick release of the finger from the button.

With the Anglo on the other hand *adding* a thumb strap may relieve the thumb from crampful muscular strain.

It's not going to do much for your air button control, though!