I think this depends on your technique for feather sticking and making shavings.
If you work slowly and deliberately, you'll avoid most side loads. But if you're making shavings quickly and forcefully using one of several recognized strong techniques that assume a fixed blade and if you then hit a knot, I could see tweaking a plain, peened pivot slip joint. Heck, I've done it on a few occasions roughing out some work.
Usually you can correct minor wobble by pressing in a padded vice.
But if feather sticking is something you do a lot of, strongly suggest a $15 experiment with an Opinel for two reasons.
Opinel by
Pinnah, on Flickr
One, the Opinel's rivet isn't filed flush so it much tougher in terms of resisting blade play of any kind. Much, much tougher than any slip joint or lockback I've owned by a long shot
Second, the thin convex blade excels and making feather sticks and curly shavings. Honestly the best blade I've found for this.
Third (who's counting?) the round handle doesn't produce hot spots under heavy use.
Fourth (I'm on a roll), you can baton with it within reason.
I'm in the process of learning my new Emberlit wood stove. For me, learning a new stove means making tea on it several times a week for a month, regardless of the weather. Today's weather was a long night of soaking rain so the midday tea required a lot of shavings and splitting several two-finger sized sticks down to a size that would fit into the stoves feeder hole.
I used my Opinel 9 and have been just to convince myself that it's all I really need to prepare kindling for the miserly stove.
The trick for batoning with the Opinel is to leave the ring undone so it pivots freely.
Oh, the tea was PG Tips, which has rellaced King Cole as my go to tea. Quite nice.
Last note, if I were to go with a slip joint for this, I would look at a large sodbuster which a really burly joint. I would avoid anything with a hollow grind too.