Looks like dev-python/sip and dev-python/PyQt at least have ~x86 ebuilds for latest versions but dev-python/pykde not. I've made it based on some old ebuild for snapshot too. There is an little patch because one file in snapshot is missed.
Created attachment 79565 [details] ebuild
Created attachment 79566 [details, diff] patch
3.16.0 is in the tree, masked though. I propose switching to kde-base/pykde, unless you really need the features added by the latest pykde version.