I'm Troy from the Adelaide Hills in South Australia. I'm a software guy by trade but like to develop hardware projects in my spare time.
I grew up with a TI-99/4A which got me hooked on programming at ~5yo before moving to PCs around '89. Around a year ago, decided to pick up a TI-99/4A for the nostalgia. That led me to develop a number of hardware improvements (including a cherry mx keyboard upgrade and a replacement VDP). Since then, I've started building a small collection of machines including another TI-99, ColecoVision, MSX (National CF-2700), Intellivision and a couple of 2600's.
I'm relatively new to the CreatiVision. I recently purchased a Dick Smith Wizzard to test it with my PICO9918 project which is a drop-in replacement for your TMS99xx VDP with VGA output and enhanced display modes:

https://github.com/visrealm/pico9918
Spoiler: It works perfectly

Cheers
Troy