Gotcha. The tricky part with that is gonna be that it's specific to the model of your entertainment system.
Means that if whoever you have working on it is non-local, they'll need to find a duplicate of your entertainment system to test on to make sure it works, which is obviously not super feasible.
If a local buddy asked me to build something like that, I had the time, and I charged fair market value for the work, you're probably looking at a couple grand.
If it was a good buddy and I only charged for parts, it'd probably be only a hundred bucks or so?
I wouldn't even really consider doing it as a remote job, as getting a copy of your receiver is more trouble than it's worth I think. Depends on the receiver to some degree though I guess.