So, I have started a development design.
Essentially, I am looking to use the Vishay block diagram for the popular TSOP parts as a starting point.

Transimpedance amplifier - got it, no problem.
Bandpass filter - got it, no problem.
Schmitt Trigger - got, no problem.
The part that I do not have an immediate solution for is the AUTOMATIC THRESHOLD CONTROL for the Schmitt trigger. It serves an important function for sure, but I am unsure how to best implement that (at least in a reasonably simple fashion).