So... Brainstorming...
Putting the chute in the front of the TSI like the sling 2 does, sure would solve some aft cg issues. The magnum is larger so it can't be done.. But the BRS is smaller...
BRS has a new chute for the Sling TSI. Its model ccubsI-08. Its based off the cub.
Its dimensions are,
14.7" wide x 7.4" deep x 19.2" high
or
10.5" wide(chute only, rocket adds 4.2") x same
weight is about same as magnum.
Is the space between the firewall and the canopy, more than 7.4" deep ?
See where I'm going ?