In 2014, I had the opposite problem. In order to get hydraulic disc brakes, I was forced to get Di2 (as they were bundled when they first came out). I have zero regrets about either, in retrospect.
The main problem you are facing is that most of what is on the market bundles Di2 with disc brakes. (I think this is also true for SRAM and their equivlant.) If you would be willing to reconsider your stance, may more options would become available, and I can promise you won't regret it (at least if they are Shimano Disc brakes).