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My efforts will not be worthy, but I've been doing a bit of doodling while injured recently. Years ago I worked in a drawing office and used the brown Rotring Isograph pens (on acetate). They're a bit expensive for the use I'll be giving them, so what's similar that'll work on textured paper?
Dip pens, ie reservoir nib, quill pen, or glass pens
Various snapped twigs will get you some great marks.
Though this year I am mostlybinyewsin...
...Apple pencil. I’ll throw my hat in the ring with a warmup.
‘Among the Beeches’ (Avebury Outer Circle)
I used to use brown bodied (mauve)? Rotring pens on cartridge paper at college for general sketching.. They are not that expensive really. Nice pens for black and white hatching /line drawing.
IMO Isograph not great for general sketching unless you work in a very tight controlled way.
Check out Cult Pens for a HUGE range of pens.
Of the top of my head I reckon you might like these for the use you've suggested...
https://www.cultpens.com/i/q/PL00324/pilot-vpen-(v4)-disposable-fountain-pen
And these are nice. Refillable too...
https://www.cultpens.com/i/q/CP00819/copic-multiliner-sp-drawing-pen
Malvernrider, they're maybe a bit esoteric for me, mostly drawing maps at the moment. I'm using uni fineliners, but I'm very heavy handed and they don't last long before the nibs splay. Need to work on that.
Colournoise, those copic refillables look worth a shot. I've got a few of those Vpens but don't think they'd work for what I'm drawing.
Mattyfez, the Isographs are about 30 quid each. I had loads of them but they got thrown out when we got CAD machines...
Stick with the Rotrings. They now do the cheaper non-refillable ones - Tikky Graphic - they come in 3 packs with 0.3, 0.5 and 0.7 weights for a tenner a pack
Best pens out there by miles, and cheap as chips. I’ve tried loads of pens and nothing beats these. As good as you’d expect from Rotring.
Here’s one of my scribbles with them:
Mattyfez, the Isographs are about 30 quid each. I had loads of them but they got thrown out when we got CAD machines…
I think I had a kit if I recall correctly, (but iso graph rings a bell, might have been a different model) I can't remember the model but it had a few different sized nibs and a couple of pens, many fond memories of doing detailed black and white drawings.
I even recall giving my art teacher an accidental permenant pin prick black tattoo dot with the smallest nib which was basically the size of a pin, on his hand lol! Whoops!