This idea is about expanding upon that. Everyone in all classes of life enjoy blood sport. If topsiders didn't like it, they wouldn't air the UMC on TV. Since we can't ICly play Deathball, I think it would be spectacular to add another fighters circuit to the game only this one centered around a "Professional" tier of fighters fighting for way more chyen, stakes, and recognition. Instead of local shops sponsoring a fighter, Corporations can sponsor a fighter. All the Corpies can attend, hell, even the dirty mixers because their money is still money. You could relax the rules to let Cyberware be encouraged and used and sponsored right into a fighter. SK has a new experimental wired reflex it wants to test? Slap it in that cage fighter to show it off!
What I envision is someone who wants to follow the path of the MMA or boxer/cage fighter/whatever to be three tiered. The first tier is something a player can totally organize and run all on their own as long as certain NPC's don't take some weird offense to it, and if you old school players remember what went down on certain nights of the week behind a certain bar in the mix, then you remember this, and that is organized underground fights. This gives Immigrants a first step into blood sports, and other plays venues of making side money hustles.
The second tier: UMC. Change nothing.
The third tier: The corporate Idea
This could create a new job :((WHATEVER NAMED League)) Organizer, Corporate Security could provide the security, and people can place high stakes bets, progress up the real professional circuit, etc.