I would suggest that Shotokai would be a good choice for Aikidoka. Master Harada is a wonderful example of a karate exponent/karate teacher.
I totally agree.
In 1963 Kenshiro Abbe Sensei invited Mitsusuke Harada Sensei to Britain. Harada Sensei was a direct student of Gichin Funakoshi Sensei....Harada Sensei was given mat space at the Hut Dojo to help him get established, I trained personally with him as there were no students in the beginning, Harada Sensei took a keen interest in Aikido, I would teach him some Aikido and he in turn would teach me Karate, he actually applied some Aikido into his Karate, developing his own style of " ShotoKai Karate "...Harada Sensei had been a bodyguard to the Emperor
British Aikido History