Haha, enjoyed the video. That was surely a departure from what I was expecting based just on the title. I have not heard of adding butter to espresso, but I am customarily late the party and last to know on trends. I actually had to Google MCT oil.
I have same grinder, same scale, same distribution tool (you have good taste). I like the trick of using the tamper to plug the hole, though I rarely have mine in single-dosing mode. I like having a steady supply of beans to do multiple shots in a row and dump when necessary without having to individually fill each dose. I have all my beans frozen in 16-oz. Ball jars (just one of the many tips I've absorbed). I don't keep track but it's probably a 3-day supply.
One thing to note on single-dosing is the E6P has a LOT of retention. If you unthread the collar and pull out the top burr you can see how much is actually collected above, below, and around the burrs. So no doubt there is quite a bit of "exchange" even if you flush and like most hopper grinders it's not the ideal single-doser. There are other reasons to run it like this though, like your observation to reduce clutter and eliminate the hopper.
Somewhere low on my mental project list is to find some mod that will allow me to seal the lid to the hopper other than using Saran wrap.