Andreas, I'm pretty sure my experiment with OwnYourGram was well after I updated to 0.9.2. I never worked on it further to get brid.gy to push the comments/likes back to my Known install, but did spend some time to get OwnYourGram to work with WordPress and eventually have brid.gy backfeed the comments/likes from Instagram.
Ultimately I decided for data portability reasons that it was far easier (and prettier) to import all of my old instagram posts into my WordPress install where I know the code base a bit better. I just finished importing all of my instagram activity to my main site over the weekend, but it'll take some more work to get them to display the way I want them to along with the correct microformats2 markup.
For Instagram/Known, if I recall, you have to correctly specify either http or https properly to make sure the two link up properly, which was an early problem I had. I also had issues with trying to use two sites simultaneously, but apparently putting the URLS of your sites into your bio on instagram works just fine for authentication.
I don't think I went so far as to register my instagram account for known with brid.gy, but I could dig back into it if you need some help. I need to document some of the process for some user manual work I've promised to do for Known.
You could also try the #indieweb IRC channel: https:/