The Pro media is very similar to the Aja IO. I’m assuming you’re monitoring your BM card. You could use the Pro media as a converter to feed analog sources to the BM card which I’m am assuming is SDI only and could also be capable of HD depending the model.
It sounds like you might need to get someone with some engineering skills to evaluate your system because you might have every thing you need right now, just hooked up poorly.
Of course, you can’t go wrong with Aja products, but if they are not installed properly you’ll have the same issues you have now.
joe