Not sure if you are talking about the vaginal swab dna or the towel. The defense tested the v-swab and didn't release the results which suggests they were not in their favor. But if I'm right they cross contaminated the v-swab back in the police evidence storage or in the crime lab, so whatever they give the defense is still going to show Hennis. About the only thing that could be done is exhume her body and test again, but I'm sure even if someone would do it (they won't), it would be far too degraded now for a result. If you mean the towel, it's already yielded a full DNA profile of an unknown male but they won't submit it to CODIS to see if there is a hit to someone else. Sorry if I misunderstood what you mean here. Just like you, I'm wracking my brain trying to think of a way to help prove he is wrongfully convicted of this crime.
The only think I can think of now is a podcast or documentary in the way of Serial or Making a Murderer to make the public see the flaws and injustice enough that forces their hand. That seems to be the only way when they are set on railroading someone to get anything to change. His lawyer saying to consider consensual sex really doomed his case and it makes me angry this wild statement was allowed to remain if Tim did not give permission to say that or approves of that statement. I still think he should fight based on his lawyer blowing his case by that statement alone with the jury and the public.
But we have to figure out a way to get that towel dna into CODIS. If the public at large understood the implications of it, I think they would demand it be done. That's why a podcast that is well done and compelling enough to rise in popularity would be very helpful (or documentary).