Carsten Möllering

My teacher was a student of Sugino Yoshio and his dôjô is the shibu of the Sugino dôjô in Germany.
So a lot of his aikidô students also practice TSKSR.
There is no "mixing" of both ryû. But with regard to Sugino sensei being a student of Ueshiba and teaching aikidô in his own right - as does Sugino Yukihiro now - I think there was a kind of "conversation" between both aspects.

Another aspect in my context here is the kenjutsu taught by Inaba Minoru sensei. Regarding the debate about Inaba's swordwork I don't want to judge "how ko"ryû it is. And I leave it to you, whether this fits to your question or does not.
Anyway the aikidô of Christian Tissier shihan is heavily influenced by this school of kenjutsu. And he does not hesitate to state this in his seminars. So during my first years of aikidô it was this swordwork that I learned when we had weapons classes. (The sword of Saito sensei was not really taught by my teachers.)
I know a lot of his students who practice this kenjutsu unattached to their aikidô. And Inaba sensei comes to Germany on a regular base for teaching his sword.

The official shibu of KSSR does not allow people who practice aikidô to join the dôjô.

Then we have Ono ha itto ryu here: There is a teacher who teaches aikido (aikikai affiliated), daito ryu aiki budo and itto ryu. His federation is not very big, but mos students who do aikidô with him, also do aikid budo and ken jutsu to a certain degree. I have never practiced in one of their dôjô.