Simple spring substitutions will get the trigger pull to 10#. They probably even have the springs already because they are likely to be the same as for the first model.

It's just a PITA to have the springs made, inventoried, installed in small planned runs, have the guns available but not selling, and the guns tracked and distributed only to a narrow market. That's extra cost.

Again, it may be mechanically easy to meet a few people's desire for a special, low volume gun, but it's not a good business decision.