Hi everyone!
I have found some infos about what has been a prototype of a Kpart Gecko web render. It seems to be named ''kecko'' at some places.
These links are of about 2004-2005:

If something could be done with it, here they are:
http://dot.kde.org/2004/09/11/akademy-hackers-port-mozilla-qtkde
http://osdir.com/ml/kde.redhat.user/2005-04/msg00118.html
http://www.mozillazine.org/talkback.html?article=5263
http://lists.debian.org/debian-qt-kde/2004/10/msg00217.html

Some other infos about WebKit:
http://www.osnews.com/story/21765/_QtWebKit_KPart_Is_Not_the_Answer_for_Konqueror_

Have a nice day!
-Alexandre