No I do recall that in his review and already took that into consideration. The skirt would obviously be problematic for the crotch grabber to go all the way up, so to be more specific, I was thinking if you could have it more sitting in between her thighs, or would that potentially damage the legs at all? I have the Babydoll figure from Sucker Punch and despite her having a skirt as well, she came with a crotch grabber and it basically just rests in between the figure's thighs. She has seamless legs as well and it has caused no damage, but I'm not sure if they perhaps use different bodies and it would be riskier with WW.
And yes, the waist grabber to use as an alternative is the generic waist grabber, such as what came with Marty. In fact, that's the spare waist grabber I have and would use for this because I used a crotch grabber with him.