Hmmm, Scintilla GTK has an undocumented feature[^1] where its initial blink and blink rate are set from GTK settings if available [here](https://github.com/geany/geany/blob/3a92129d61d4d8e96136e29d4709bb638527be40...)
So that would work if you can set `gtk-cursor-blink` and `gtk-cursor-blink-time` (in ms) in GTK settings via your desktop or otherwise. Works on LM (XFCE from @oOosys and Cinnamon for me) which is a GTK focused distro. Others can test on their desktop, for example not sure if a KDE desktop will set GTK settings.
[^1]: here I actually mean a _feature_ not a bug :grin: