Also, scroll up to see Alan, the dude behind Valve's Lighthouse tracking tech for VR. And now I just realised it's >20 years since I first browsed his awesome hobby website Alan's Lab.
I've owned two second hand Rancilio Silvias and they are very well built, I've seen them used commercially and while this wouldn't be recommended they can take some abuse. I use it every day and it's perfect, the Aeropress lives in the van now.
Pretty sure you can eat Fluorescein with no ill effects other than turning your piss dayglo. It's very widely used as a 'non-toxic' tracer dye so I'd imagine studies have been done.
Shooting I'm square crop has been a thing for a while now, it means clients can re-crop the same footage for different outputs. And usually means framing is a nightmare and never really works out well for any of the output formats.
It would definitely need some processing. Bit of Fumed Silica might also help to make it free-flowing.