Trying out a 1 year 1 kit challenge... and its all gonna be film! oh.. and then scanned! so just a smidge hybrid.
I will primarily be shooting Portra 400 (c-41) and it will be lab developed. I will also be shooting a pinch of Pan F 50 here and there which I will develop myself at home using a Jobo daylight tank with basic chemistry. Scanning will be done at home on an ancient Epson flatbed or with my Phone (iPhone 7+) via a light table.
The Canon 50/1.8 EF is a decent lens; Mk I actually nicer than Mk II. You may find it a bit noisy and not as fast as what you're used to, but it has very good optical quality. Your EOS 1 is also a very good choice.
My Rebel G (EOS 500N) and utilitarian 50/1.8 Mk II produces surprisingly good results.
For 15 years all I had was one camera body, one lens (55/2), and B&W film. Sure, there were some limitations, but I produced a lot of good images.
Color film and processing is expensive. Get a 15 watt light bulb and a piece of glass and make contact sheets of your black and white negatives . Get 1 tray use the same developer you used to develop your film just save the once used in a full bottle. Same fixer RC paper.
There's nothing better for teaching proper exposure than a contact proof sheet. If you are good every image on the sheet will look good. I use an incident meter, but sunny 16 etc. Works just fine. Someone on here posted a video on Edward Weston, all he did was contact prints. 4x5 to 8x10 film. Didn't have use for an enlarger.
Have fun!