Hi Mate, you might want to consider one of these Eden's. Fabulous necks and you can shape the headstock to replicate your Warwick. I use one of these on my Jazz bass project build and it's magnificent. Certainly as good, if not better than some of the Warwicks and Fenders I've played.
[url="http://www.ebay.co.uk/sch/i.html?_odkw=eden+bass+neck&_sop=10&_osacat=4713&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.Xpaddle+headstock&_nkw=paddle+headstock&_sacat=619"]http://www.ebay.co.uk/sch/i.html?_odkw=eden+bass+neck&_sop=10&_osacat=4713&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.Xpaddle+headstock&_nkw=paddle+headstock&_sacat=619[/url]