Yes you can re-veg a male plant..i did it couple years ago with a Nirvana Ice male..it was one i liked cos it showed its sex early and i crossed more strains the 2nd time around
hvnt tried those yet, but other crosses i make all are viable.. nice dark speckled seeds...im gonna try a few those in my second side project this late winter...some those 11 Spartan x Ice and Ice x 11 Spartan mixes and also a Crystal x Ice