A pity, several month ago i asked this and VKB said that Cobra M5 adaptors would come "Yes, they will be available sometime in March 2017" the quoted answer. Now, from your words rrohde, it seems its unlikely...I understand it, keeping word is less proffitable than buying MCGs for everywone.
I would pay happily that 40usd to get that cobra M5 adaptor for my Gladiator Pro, and then the MCG pro for a Gunfighter. I ll have to think about what to do but as of now, I think I ll pass on the gunfighter and just buy an MCG for my GL Pro MkI
BTW: thanks for all your constant feedback rrohde, you are without any doubdt an incredible rep for any company