I've finally finished the project and it's just completed a month of beta-testing by some of the fine folks over at the Denial VIC-20 Forums (I'm 8BitGuru over there).
It lives up to the aspirations of its name - it renders 40-column text faster than the C64.

The Github repo includes the full assembler sourcecode as well as the cartridge binary which you can use with an emulator like VICE, upload to a flash-cart like Final Expansion 3, or even burn on to an EPROM cartridge if you have the gear.
My next project will be some sort of windowing GUI for DOS-based PCs.
Denial: https://sleepingelephant.com/ipw-web/bu ... hp?t=11264
Github: https://github.com/EightBitGuru/FAST-40

