Daphne
Well in answer to your post, I think your wish to enter chastity my means of a mechanical device is reasonable. I would hesitate to advise you to somehow make it permanent (though I am not sure you could do that anyway). But through my own life experience I know that changing one's mind and attitudes is a fairly common event. And while "permanence" might be a worthy goal, my advice would be to keep that as a sort of distant Everest to climb and in the meantime take each day as it comes and enjoy it to the full.
The question of finding a trusted (and hopefully loving) keyholder would seem to me an obvious first step though possibly some sort of time safe option might be viable. I am not really qualified to understand all the in's and outs of using time safes, though perhaps @Tobbe could help?