You have professional gear which is hard to match with a lot of domestic equipment. What you really need, and should save up for, is a pre/pro that has balanced outputs. Then your trouble will be over and you will get the best out of that equipment. I would absolutely not buy a receiver.
What you need is something like this.
If you don't want to spend that much then an older used one is a good bet. Pre/pros generally have a much longer life that receivers, which are basically miserable pieces of equipment, especially in a situation like yours.
There is a very nice
Marantz 8003 on eBay right now. It is one like I use in my main system. I bought mine in 2008. Actually this might be a better fit for you than a new one, as it is not bloated with features that should never be in a receiver or pre/pro. Also it does not have the useless Atmos.
I would not hesitate to put that used Marantz 8003 at the heart of your system, It will solve your problem elegantly and likely give many years of service.
I have zero plans to change mine.