Let's break it down.
*You figured out a way around a previous barrier. This removed your safety latch.
*Letting your T know puts a safety latch back in place.
*Counting on dark days never returning as your alternate safety latch is not realistic. You know this.
*You also realize that you would need someone to trust at such a time.
*You have a knowlegeable person you trust. With whom...
*There is an agreement already in place regarding your safety.
*You really want to live.

It's a no-brainer.
Like gina_re said. You've answered your own question.
Sometimes we just get too much swirling around obscuring it.

Excellent decision Tigger, printing it out and letting her know. It's the right thing to do.