I think, since her killer has already been apprehended and is in prison (thankfully), the value of a full-body recon with the mock-up of the clothes would be to try to jog people's memories of possibly seeing Jane hitchhike (wearing the specific clothes she was found in), particularly around the area Chouest alleged he picked her up from (Visalia/close to College of the Sequoias). However, it's been so long since, and I don't think many, if any, people would've seen them together.
I'm reading an article from 2016, and it reminded me of the fact that I forgot that Ventura Jane and Shirley Soosay were killed very, very close together - found only 4 days apart. Some of the article's wording is a bit confusing to me as it goes back and forth between describing Ventura Jane and Shirley Soosay's murders. We know Shirley was brutally murdered in Chouest's car (which he forced his roommate's sons to clean up after the fact), and then Ventura Jane was brutally murdered a few days later and there is no mention of the sons being forced to clean up the car after Ventura Jane would've been killed. I imagine there are not witnesses to her murder/abduction like there were with Shirley's.