Do you like OK prefix or you want it to for a specific use ?
I believe the OK is too strong to be together with only 2 more letters
It's always the popular OK so the eye focus on these letters and forget the rest
If it's used as a prefix is too strong, if used as suffix it embeds with the word
Look for example the domains of ifonly
okqd (ok-qd)
jmok (j-mok)