How can I persuade my partner for an extended period of no release?

We are exploring chastity. I get very aroused and secure myself in a lock. Whenever I ejaculate, the discomfort becomes something I can’t be bothered with. But it is a genuinely hot fantasy for me and I struggle to let go. My partner doesn’t want to keep me denied for too long; she feels she would miss my penis. She worries that after denial ends, I will cum quickly and that I might be too horny to focus at work. We discussed getting a piercing so it becomes impossible for me to pull out. I believe she is okay with me having this done. What I have read suggests you should abstain from sex for 4-6 weeks following the piercing. I think this would serve as a good initial denial period. In theory, proper denial could start right after those 6 weeks since sex wouldn’t be an option anyway while healing.