Almost the same here! ADHD and a lot of seasonal hobbies, like bookbinding (just love moleskine, and I started making my own) mechanical pencils (rotring ftw), paper in general
https://www.jetpens.com/Platinum-Pro-Use-II-05-Drafting-Penc...
They’re out of production and even more expensive than a Rotring, but it’s my fave (even more than my R800). You can get them occasionally on EBay.