I'm sure there are programs to turn your regular keys into macros. I'm pretty sure steam also has a similar feature.

Personally I would just recommend that you commit to learning the muscle memory. It is easy to practice as it is a heck of a lot more generous than Dark Souls when it comes to i-frames. You just want to do it in one split second clenching motion. The only thing you can mess up is hitting jump before block. Don't even think of it as hitting two separate keys. It is all one key.