Well, to mark rows in batches of 10...I just use a piece of contrasting cotton thread. On dark yarn, white...on light yarn, tan or brown.
Easily removed later. I used to use little brass safety pins...but, they are time-consuming to remove later. Yanking little threads is quick! And cheap.
The things in your Photographs may
be too large...and yes, the clippy thing at the bottom could catch on yarn...but, just try them for awhile...you will know!
Post a followup!
If you want me to, I will take a close-up photo of some of my stitch markers...they are not perfect...but good enough! I got better after my first 10 or so.
Some were kinda spendy to make, some were inexpensive. Depends on the findings, etc! Ya' can just go crazy in those bead shops! A dangerous $$$ place $$$ to hang out if ya know what I mean!