Suggestions for an anon meet-up with a third?

Me (27M) and my partner (28M) have been together over two years. Sex is great, but we both prefer to top. About a year ago he suggested trying a third who’d bottom for us, with rules of no kissing and the third being blindfolded. I was fine with that, but when we tried it I couldn’t stay hard. I think because I prefer intimacy when topping. Still, I found it hot watching him enjoy himself.

We tried again with someone I chose, but I had the same issue. I told him that meeting a stranger with no contact beforehand and no intimacy just feels too transactional. He understood and said we don’t have to do it again.

But after thinking on it, I’ve realised I’d enjoy it much more if I were the sub. I’m naturally more submissive and kinkier than him, and in all our play I’m the one in the sub role. So the next time we talk about a third, I want to suggest both me and the third being subs for him.

One idea: find someone close to my build, blindfold us both, and let my partner use us both how he pleases. It’d be even hotter if we were both in full latex, keeping it anonymous while putting me deeper in a submissive role, as well as him not knowing who is who.

My concern is that it’ll be hard to find someone similar to me, willing to do anon, and able to provide latex gear (since I left mine back home when we moved). Does anyone have other ideas I could suggest?