It's already not what most people would call a sensible price. Seems difficult to significantly shrink a phone that has a pair of M.2 slots in it though.
I wonder if you'd find the Xperia Ace (or an XZ2 if you want used) close enough for you. I think the Xperia line is where I'll be looking for my next phone, personally. https://phonesized.com/compare/#632,968
Edit: additionally, it looks like the Xperia is thick enough to have no noticeable camera bump. Has a 3.5 mm jack too; I like the look of this quite a lot.
I don't care much which OS I have to run, they are all the same now. I just want a smart phone that fits in a single hand.
I tried the palm and it is a bit too small, and the battery life was insanely bad.