Magnets? Nude renders for heavily morphed (body) characters?

You could always do the nude renders with the tricky morphs (NGM, etc) and then if you need a render of the same character clothed zero the custom morph and just try to approximate the appearance of the custom body shape with the standard morphs in the clothing that do work.

Example; let's say I have this character that I made really specific custom body shape morphs in Zbrush for, of course this custom morph is great for nude renders but causes a lot of problems when I go to dress the figure for a clothed render. Well, I go ahead and zero out those custom morphs, dial in similar but not exact morphs from morphs ++, dress and conform, adjust to match thereabouts with the compliant morphs, voila! A clothed boob doesn't have to look exactly like an unclothed one :)... I think you're being too concerned with details that probably no one other than yourself will notice. Improvise.

... Probably why vendors create their characters with separate head and body INJ's.