Replacing Menu for Fn and adding Menu to add-on
Great choice 🙌 And thanks for adding R3 1.75u Function,
and having R3 \|, R4 <> ISO keys in base. This is looking up to be the best kitting we've seen in an Infinikey set thus far.
Just wondering, what's that darker blue ⭠ in the base kit for?
If you see something that spots your eye, be sure to let me know.
The UK R4 key should have a full pipe (\|), not a broken one (\¦). If you look at the ISO-UK layout, the broken pipe is located as a tertiary legend on the `¬ key, but since Tidal doesn't have sublegends, it's not necessary. Either way, the R4 key should be \|. This change applies to both the add-on and mono kits.
Are the regular F, J and num 5 keys barred or are they non-homing? I'm assuming they would be barred, but they aren't labeled as such in the kit image.
Since a white R1 Esc key is included in the base kit, I believe the one in the mono kit is unnecessary and can be removed. I think the same applies to the R2 and R3 white Esc keys, since they're included in the add-on kit.
Finally, consider adding white accent arrow keys, either to base or the add-on kit. You may want to move the accent Insert to add-on as well, since I'm not sure how many people would use that key (small layouts are more popular than ≥TKLs).