Adjustable Chastity Timer

Hello everyone, I’m a newcomer! My girlfriend and I both engage in mutual chastity play, holding competitions where we add or subtract time for each other! But my current schedule means I’ll often be away from home for several weeks. Right now, when I travel, we use online ‘fixed’ duration keyholding timers. We’re looking for a system that the other person can adjust based on bets. (For example, if I win a bet, my girlfriend could increase or decrease my time; and vice versa) Our current method is simply taking a photo of a combination lock. An online solution would be ideal, but any external app works too. Appreciate any advice or suggestions! Cheers GGA & EL