Hex Borders [adapting a new feature]

[SamPassmore]

Hi Prof. Lumley,

I came across this plotting package which will be useful for a paper I am writing.
An addition I want to make to this plot is to highlight particular hex's as is shown in the accepted answer in this question:
https://stackoverflow.com/questions/76685323/highlight-particular-hex-bins-with-geom-hex

As far as I can tell, there is no way to currently do this in hextri.

Do you have any ideas on how I could adapt hextri to do this?

My first thought was to plot a layer of hexagons ontop of a hextri plot where the borders could be manipulated, but I can't figure out how to reproduce the hexagonal patterning.

I think the hexagonal patterning comes from hexbin::hexbin, but I am not sure how to use the hexbin object to create a series of hexgon polygons.

Any pointers would be appreciated,

Sam