If you're really willing to pay top $$, then there are a few safe windy windsurfing locations, at a cost. Just picking at the thread title mate...

Gorge, Garda lake, Quebec City (believe it or not). Donno about Hawaii at this time of the year.
Seriously, an alternate but cheaper way, is to get into lesser winds than the current standard - requires one longer boards perhaps, that's all.
Yet another alternative is to go out anyways in lesser winds and practice freestyle moves. This is a very popular thing here nowadays, as the wind is often crappy here too. Popular - at last: it's just amazing the tricks the guys pick up for when the wind really blows - it translates into big air moves almost right away.