Online chastity and self locking discussion

My girlfriend is working abroad for a couple of months. Meanwhile I want to get used to my relatively new My-Steel belt. I am alone here since the beginning of the week and I already managed to do a couple of nights in the belt, having a continuous lock-up of 12 to 18 hours. My goal is to increase this time to a couple of days. After that I think hygiene is an issue, but a short cleaning break is not really a wearing break as discomfort is concerned. I asked her to be my online keyholder for the time, as this is something I fantasized about doing before we got together and now I don’t want any other women involved in my sex life. The primary key is locked in a Kitchen Safe and I have to set the timer. Then I can send her pictures of the timer as a proof. The secondary is wrapped in a tamper-evident way, this way emergencies are no problem but I still cannot get out without it being traceable. She is very constraint on time and only has a few minutes here and there to answer chat messages, so the setup is pretty much like with a professional keyholding dominatrix. I asked her to be given tasks and the first one was to create a list of 20. This is easy for her to check. Now in order to make this really interesting, there should also be punishments. I mean I do want to be kept locked up and teased and humiliated, but having some punishments available would certainly make it more intense.

• The first idea that I had is that if I cheat, there will not be any sexy messages for a certain period. Her suggestion was three days. It seems a little bit short, but I one can make it longer without a problem.
• Then the other thing could be to make me set the timer to a longer period than usual, say a few days at a time.
• Or when there was a release scheduled it will be postponed.
• A classic seems to be blackmail. However, I dearly hope that my loving girlfriend would not follow through this something like that. Also I would presume that it would be as embarrassing for her as it would be for me if she told some mutual friends. Therefore I won’t use this. What other punishments could there be that are somewhat enforceable from a distance?