An equity stake works fine too. They get a share of the price appreciation/profits, and one or two seats on the board so they can have a say and keep abreast of internal developments.
Just trying to think outside the box, which I'm sure BD and any other potential suitor is also doing at this time.
I am a big believer that the Diagnostic division will be sold to fund the development of MANF. More importantly, I am fairly confident the Holding company was structured that way for a reason.