Here is my two cents:
There are other much better options out there other than the cb6000 you mentioned.
A) I would recommend the BON4 http://www.bon4.com/index.html
B) or the Boy Trainer 2.0 at Mr. S http://www.mr-s-leather.com/CB079/boy-trainer-2-0.html
Both of these are made of silicone and MUCH more comfortable to be worn over long periods.
You mention you will only be wearing it for short periods, the person that has the key will determine when the lock is taken off. That could be a few hours or a few days or weeks! You never know!
I would also recommend you get one for your partner so he can experience it with you. Fair is Fair! haha
Cleaning is very easily done during showering. Only thing you have to do is get a Q-Tip and some water based lubed on the inside surfaces makes wearing it for long times much easier! this all can be done while it's locked on you.
I would also recommend shaving all the little ones. you will be happy you did this if not you could get some pinching which doesn't feel good!
I have tried this before for a short duration, but not with anyone that kept my key. It's an experience that everyone should try. Sleeping is tough at first especially if you are the type that has morning wood. but you get use to it after a while.
JJLeone asked about erections. The point of the device is to prevent an erection so you cannot play with yourself or anyone. It's basically pointless to try and get one.
Good Luck and keep us posted about your results!
and I think you should post pictures!