I mostly use the strap for my Regina. Oddly enough, all my vintage bags I tend to use the crossbody strap even if they have a top handle (Willis, trail, Regina). My newer bags I don't. If they have a shoulder strap (Chelsea) or a top handle (Rogue), I don't use the crossbody strap.
I will say, I'm 5'7", my torso is longer and my legs are short to average, so wearing the Regina crossbody isn't an issue. It hits me right at the hip. The strap is thin, so it tends to dig into my shoulder after a bit. I do want to carry it by the handle, but the handle is so nicely shaped that I don't want to ruin it. I know, I know.
As @pruetjx said, you can't double up the strap and those clasps are extra dainty. I have seen other people knot the strap to the desired length. I'll try my Pocket Purse strap tomorrow and see if it works. The rings on the Regina are smaller.
Yes of course I can knot the strap! can't believe I didn’t think of it!

And with winter coming I think it’s probably going to work better that it has such a long strap. A small pet peeve of mine is actually that the strap on most vintage bags are too short to go over my bulky winter layers and coats.
That’s it. I think I’m sufficiently convinced... just ordered the bag, in black!

If you could check your pocket purse strap tomorrow I’d still really appreciate it. The pocket purse is on my list of purses I’d like to acquire some day so it’d be good to know if the straps are interchangeable. Thanks a lot!!