On my nice to have list until then I carry spare u-joints and a shaft on the out of town/tougher runs as insurance.

The stock driveshaft is pretty strong, besides u-joints going out I’ve only seen a few actually break mostly the flange ears holding the u-joints cracking and whatnot.

When the stock shaft/u-joints do fail it can get messy depending on the situation. I’ve worn out a u-joint on my pathy shaft and changed it /wo loosing that much fluid in the tcase by plugging it and being on flat ground while I put in a new shaft.

Now for longer travel yes a two piece CV DS will help out (more slip, higher angles) in that regard and since it will not be as larger diameter wise you’re less likely to contact the rear cross member but it still may need to be notched. Another benefit of a custom DS is you can make it stronger than stock buy using bigger u-joints and/or alloy materials.

With the extra travel the revolvers provide with the appropriate length shocks yes you can pull out the stock driveshaft and one of the reasons why AC recommends the limiting straps.

As far as the mods for the SYE…described as a hack & tap, with the right tools it’s a half day job but the shaft is super tuff and you’re going to need a strong drill and great beffy sharp bits or more. If I was going to do it I might skip the hack part and just tap it that way I could reuse the stock shaft as a spare with some minor changes.

CV shafts run ~400+ depending on what you get, require more maintenance, nd are more prone to wear than regular ones IMO.