While it does that on the Archimedes, BBC Micro, Amiga and Atari ST the VT320 does seem to contain a different ROM for 132 column mode.
It's actually quite close to the BBC Micro font (not the Mode 7 Teletext/Mullard SAA font).
Here's a starting point based on me squinting at the ROM image:
https://fontstruct.com/fontstructions/show/2607771/bbc-micro-7-3
