So, I don't know if anyone has done this before. I haven't been keeping up with the forums for awhile.
I can demonstrate a subframe setup that has a VACU increasing pressure to 64-ish in a 3x3 basic wall setup, while still eating particles... and not heating up. In the same save I go the other way with with the setup and create a VENT that still pushes particles away but reduces pressure to - 70- ish.
I used this process to create abnormally fast electrolysis in a previous save.
"So, I don't know if anyone has done this before."
Sort of, I used a Ligh-Thdr mix for my nano fission reactors.