Help replicating CSP Snowneko pen

[CrazyCatBird]

Have you tried these 2?:

Pen by SchrodingerCat

Ink Pen (CSP-like)

I made a G pen brush, inspired by one of the brushes I usually use in Clip Studio: [V1]

Pen By mdfm28

Cheap Ballpoint pen Brush

I made this single brush preset that I use for casual sketching. This supposed to imitate the look and feel of cheap ballpoint pen that I commonly use. This brush uses multiply blending. Using this brush on a transparent layer may result in a thin white outline. Use in a flat layer or in layer with ‘darken’ blending to remove the outline. [Testpen] [testpen2]

They might meet your needs.