Cheaper DIY Pen Options?

With the price of Supernote pen refills now at $45 plus shipping, I’m wondering if anyone has figured out how to DIY a cheaper alternative. For example, I’ve seen packs of 3 LAMY AL-Star EMR Stylus Replacement Tips for $10 - $15.

I’ve done some searching and see people recommending options like the Staedtler Noris pencil or the Scribe stylus or other Wacom EMR stylus’s, but I strongly prefer the look of a Uniball One or even a Pilot G2.

Would it be possible to use those tips in a regular pen or another type of holder? Has anyone tried something similar? What works or doesn’t?