Dare I say... Rear eject???
Go you one better, SEGMENTAL recovery. Modification of Estes Wacky Wiggler or Odd’l Rockets BreakAway
Each fin is attached to a 1/4 diameter through-the-wall body tube segment
Segments are linked into motor mount pod, maybe by rods attached to nose cone, but there are lots of ways to skin this cat.
At ejection, nose cone kicks forward, pulling the fixation rods, releasing each of the four fins.
Kevlar thread attachments between all parts, nose cone, pod, four fin-tube units. If you do a standard upward flight profile, you HAVE to keep parts together or you will never find them all. It actually works amazingly well, although this will be a little different with fin units separating laterally rather than BreakAway separating longitudinally.
Alternative is CATO recovery, where you launch on a Zero delay motor and all parts separate about 25 feet above the pad (very dramatic, especially if RSO isn’t in on it.). Finding 6 parts that separate 25 feet off the pad is doable (paint them bright colors, including the motor mount and the INSIDE of the fin units.). Finding them when separation occurs 100 feet or more above the pad, more of a challenge.
Fin units (tethered or not) will fall with the tube side DOWN, as that will be the lowest drag, so the fins are unlikely to be point of first contact when rocket hits Terra all-too-Firma
So either Segmental or CATO recovery is a way of recovery delicate fins intact (although you have to basically DeConstruct the rocket in flight, it’s still kind of fun)