No, the Crucial SPR will not be helpful in any way for beefcaking or hubstacking your Drifter. To answer previous questions and those that have gone unasked, you cannot put a C bearing in your Drifter without first modding the yo-yo and putting in some other form of spacer. The Crucial SPR (and just about every spacer on the market) is not just going to drop into your Drifter either. It will take a decent bit of cutting the Drifter on a lathe to make it work.
After putting in the Crucial SPR your option to beefcake will be out the window. Speaking of beefcaking, there is no reason why you should need to use it as a means to widen the gap on the Drifter. Stock, the gap is plenty big for even the most complicated string tricks and widening it by a significant amount with beefcaking is only going to lead to kickback. If you want to max out the gap, a shim under the spacers will do the job. If you are looking for the string centering aspect of the beefcake, then by all means throw in some thin brass spacers and have at it.