You could get a used HW100K with scope and a tank for that sort of money. People claim the HW100K is heavy, but it’s not.
Unless you like tinkering with guns I’d avoid the AP900 and similar Chinese stuff.
We’re all different, but I consider a 3kg gun reasonably lightweight, some of these plastic tactical things at under 2kg are too light in my opinion, probably only any good strapped to a tripod. I appreciate you’ve had a serious injury, but some weight is of benefit in a gun for stability, and unless the thing is a total boat anchor, I think balance is as important as weight.