So Lejes came up with this Better Cane of Byrna script.
One of the most useful things it does is allow you to enter a decimal-point magic consumption rate, such as 0.25, using a D# argument.
I believe this is the relevant code:
That is to say, Item 55 specifically, since I also use L2 Boots (Item 124) that do not consume magic.
I was planning to set the magic consumption rate to 0.5, and I don't mind if it's "hard-coded" rather than a D# value. Either way, I think a thing like this would be incredibly useful for anybody using the boots.
(Also, the script instructions say the Cane of Byrna should have its magic cost set to 0 for the code to work, if that has any relevance here.)