[ajftj]

I've done this, when I was diagnosing issues with a bent output shaft.
I drove more than 20K on local and freeway. Nothing suffered as a consequence.

I did give it some thought, but there's really no difference to the drivetrain.
Ok if you gave it extreme load you are putting 100% through the front which it might not be designed to do. Just driving normally on the road, nothing to worry about.

Just mulling over the original SYE point of your post.
Probably a dumb question, just...

Assuming you have done the transfer case output shaft swap already and now you want to modify the shaft?

I did the SYE kit on mine, the new output shaft is shorter that the original and changes the required length of the tail shaft. Didn't want you to be modifying the new kit before you do the transfer case part.
Mine was a good fit, but the seller wanted measurements of the existing parts and intended lift before shipping.