One of the problems is that everyone in the 1911 business is using a different spec. Les Baer frame's mainspring housing holes are not the same spec as others. He uses fullsized frames for commanders. SA's 1911 frames are different then Colts. Then you move into parts where if you are a parts manufacturer like Wilson or EGW you have to build them oversized so they will "fit" a wide variety of frames, slides etc.... That is why we end up having to fit everything
When you are building a replacement trigger for a Glock 19 Gen 4 you know that every single Glock 19 Gen 4 is going to be built to the same spec. The part can be made to drop in because there is no variance in the spec. The same is true for the S&W M&P, Sig P320 etc..... They all are the same so building a drop in part is much easier. You could do it with a 1911 style polymer gun but there is no guarantee anyone else's parts would fit. Unless it was a big seller no one would make parts specific for your gun so you will still be picking from oversized parts.
@John Travis is right that if there was a market for it they would make it. I just don't see the market beyond the niche that the Wilson EDC guns and the Dan Wesson Vaporware are playing in. There is no large economy of scale production to be had for this type of design without LEO or Military sales only commercial sales.
Plus on top of that unless you made the frame just like a 1911 the actual feel of the trigger pull in your hands might not be the same. The Wilson is not yet it is exact what you are asking for.