Yeah, I would but I don't have an available usb-c port.
Got it. I also need more TB ports than my iMac has, so I got a Sonnet Echo 11. But that's a lot more $$ than an $11 HDMI splitter, hence I understand why you want to explore that solution first. Just out of curiosity, what are you currently using your two TB ports for?
If you do try it, let us know if it works for you. The Amazon reviews on this, for those who tried it with a Mini, are all over the place. If it were to guess, it looks like it *might* work if both displays have identical frame rates and resolutions, and if you don't mind a reduction in picture quality:
and here's one with an M1 Pro: