I tried doing that during initial experimentation ('cause I'm bad and couldn't get late j.C consistently ;_;). Didn't seem worth the damage to me. What I did was 5B 2B 5C 236B236B236C 214C (delay) j.C j.22B 2B 5C j.BC j.BC j.236B. It did maybe 100 more on VSion, so I gave up on that. Maybe if you do j.C 22B 2B 5C j.236B air combo pick up instead, but that seems like work.
EDIT: I'm testing it now and I can't pick it back up after j.236B after ten tries. Probably 'cause it's me, but either it's really really tight or impossible, 'cause I don't have much trouble with regular j.236B combos.
EDIT: I tried 30 times and the air combo after j.236B failed every time. Either it's MBAC Kouma Rekka combo tier difficulty or it's impossible. Someone with decent execution test if it works~ 5B 2B 5C 236B236B236C 214C (delay) j.C j.22B 2B 5C j.236B j.AC j.BC j.236B. Thing is, even if it does work, it'll do maybe 200 more than the regular j.C 5B air combo pick up after 214C. That said, the knife relaunch feels easier. But you throw away the knife. And I like the knife.