I'm pretty sure praxis does a 52 or 53 that fits a compact spyder. More to the point I don't understand your comment that you prefer being between your 50 and 34, this would be reliant on your rear cassette and maybe that is the better place to look for several reasons including cost. For starters a 50- 11 is a slightly bigger gear than a 53 -12 so unless you really need to/can push a 53 -11 there is no need to be there. A 50 -34
up front gives you a broader range to any cassette than a 53 -39 and certainly than a 52 -39. So the compact gets you a slightly bigger gear, less overlap and and smaller gear with tighter shifts than the standard. Get a gear calculator chart and sort out your options with compact versus standard and various cassettes.