I wouldn't personally. You'd want to find out what that will do to the spring rate.
There's a few good reasons all of the kits out there have a max lift of 30mm.....it's the limit of how far you can go while keeping good suspension geometry and also retaining some negative travel (can be an issue if I get a bit too enthusiastic off road). It's also the limit of the angle that the rear CVs will take, and that's with the diff spacers that the Seikel kit comes with.
If you do go for the options of resetting the springs, you'll just need to be very careful they haven't gone too far.
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