The only problem I see is that you may bend the main shaft before the blade grips break.I dont know how strong that shaft is but in the event that you have a crash bad enough to break the grips you may also bend the shaft. Then again you may never have a crash bad enough to do any of this damage. This is only speculation. It takes a LOT to break a blade grip. Ive had some pretty wild crashes in my learning and only ever broke 1 set of grips.
Ive looked at that shaft youre talking about online and Ive also thought about getting it. Only thing that sux is that if you do bend it then you have to order another 1 and wait till it gets in.