I think the main thing would be just using a non-sealed beam headlight, and then you can just put what ever globe you want in it.
Considering that the face-lift square headlight KE55's didn't have sealed beams, I doubt a k'sev would. Just check if you can remove the globe from the housing (rather than it all being 1x sealed unit) and you should be right to go.
As for aftermarket housing, you could get something like this to mount them in....
http://cgi.ebay.com.au/7-Clear-Head-Lights...=item35a62ccafe