How difficult would it be to have a "Universal Sled" that can be used in rockets of differing diameters?
Perhaps using some form of adaptor like those used for motors.
It's seems like cake. You just untie your shock cords, and move the sled, and the bulkheads. The coupler stays with the airframe, because it's fitted already. Especially the three silly bolts and the pin hole. Each rocket keeps it's own coupler.
If you're dropping into a different sized rocket, you could just swap out the bulkheads as well. It's just 4wires to reconnnect. The bottom bulkhead is already on a JR style connector for quick disconnecting. My primary is on the left with all black wires. Secondary everything on the right, red wires.
Only downside is you have to use the smallest sled in those rockets. Which kinda sucks.
I decided to simply just run 4" rockets only, for now. I just made a 4" bay from a Madcow Torrent. It fits right into the coupler on a Lok 4. Needs a little bit of tape, so the bottom bulkhead has no play, since the Lok tubes are a bit thinner. It's no big deal. Hoping to get my Level1 with a Zephyr or Lok Goblin this year, and then fly the Lok4 and Torrent DD. I just started building those first, simply because they're in stock, and I felt like building.
I'm not following how this is complex. You have one DD system. Then you have another. It's not like they have to network or anything. One +1 second setting, and one main setting 200 feet less. It's no more complex than two separate rockets. Your just tossing it all into one bay. Which is cake on a 4" rocket. Heck, there's room for another entire system for double redundancy.
If the rocket needs an ounce or two of ballast for stability, why not use redundancy for that? Lead weight that does nothing? Or a 9v battery? Seems like an easy choice.