just do it, i drive my VL with a spool daily, you get used to it real quick, only thing i would sugest is putting some stockers on back/all round coz it'll chew out ur tyres real quick even if you drive it soft. of course thats just for street driving, if it will genuinely only be to the track and back then yeah, just leave ur rims on then
edit: forgot the other part of the answer, your other options are a rebuilt VL turbo LSD/r31 lsd, or any BW78 series diff(i think its the BW78) but VLT is probly the more common one. allow a couple of hundred for geting the centre, and another 4-500 rebuilding it. if you do get a tighter spring in the centre, like 200-300pound, but then it will probly start ating like a locker anyway. keep in mind these diffs are notorius for wearing ot quickly when doing burnouts etc, i htink the 300pound spring will fix that somewhat, but is it really all worth it for a cheap drift hack?