i feel that i am very suited to answer that question--i am 6'4'' slim build and not strong or fast--but i have been in martial arts for 4 years--i take +phan-ku ryu jujitsu+the point of jujitsu is to not use any strength--i would niot take akido due to the fact that akido is the pure from of jujitsu--if you are doing jujitsu perfectly then you are said to be doing akido--since akido uses no strenght--but to start off i would highly suggest jujitsu
www.phanku.org
and the point about a wrist lock--this aint no segal movie--althoug i have used a wrist lock in real life it has never been during a fight--i use it before a fight starts--like if a person grabs me --or pushes me slowly--(dont believe that shit you see on tv)