Yes, you can do video calls and phone calls on these platforms (or at least on SextPanther and Loyal Fans, not sure about OF). The problem with all these sites for what you want to do is discovery and just having a more educational focus in a mix of more explicit content and cam girls, etc. I'm not sure they are sites that couples would go to. I know different creators have their own sites with more of a couples focus -- like Erika Lust and Stoya -- but, again, this is more explicit content. And I remember that Troy Orleans did, at one point, I think, gear reviews from time to time but I think they were on her Instagram and she didn't try to monetize them.

You do have a ton of content, so you could upload it all to Loyal Fans and then mix in the new reviews and see how that goes. (I think OnlyFans lost a lot of good will in the adult world with their fluctuating policies.) I've also seen some creators share via Patreon and Substack, although their TOS around adult content are tricky.