I know yinhe, but Fujitsu already look for customer all over China.
Fujitsu already made introduction to me by yinhe, but Fujitsu did not have objection for me to buy IC and use other China manufacturer for own design, it was no problem.
As far as i know they prefer all hardware solution is nearly the same, but leave software solution to single customer, that way they can customise API to know configuration.
Its good idea, because of their lack of support people, but not always good solution for end customer.
Anyway, there is still possibility to buy SDK, I am sure of it.
You should ask Fujitsu for some contacts to buy in design and SDK from third party, if you want no pay royalty then you will pay big $$$ up front, probably not get all source code either, only parts, but what you want is possible.
As Fujitsu support people already know many German company who can offer license design.
Perhaps problem is different from what you think, perhaps because of only small amount support people, Fujitsu has enough customer already.
:F