Hello there
My understanding of the FAA and JAA regulation allows you to fly your CJ2 N registered single pilot and if the right hand seat guy doesn t need a type rating to act as a safety pilot , he can t log the hours flown as P2...
To actually log the hours ;i think that you need an SOP certifying that your JAR 23 or FAR 23 airplane is operate in a multicrew environment and so need to be commercially operated...
This is just my word and as to double check
Fly safe but fly fun