Maybe try a box of plain jane Tombow Mono (Professional) in HB or maybe the Tombow Mono J? You can order the Mono J on tombows us website, mono professionals are very widely available (Amazon, dickblick, other places).

https://www.amazon.com/Tombow-Drawing-Pencil-Graphite-12-Pack/dp/B00AQENNJK

https://www.tombowusa.com/mono-j-drawing-pencil.html

Mono 100’s are great tho, and so are Hi-Unis!