@crazycells Good points, thanks. I completely forgot that classes are added - makes life much simpler!
EDIT - seems this is pretty straightforward, and only needs the below CSS
.upvoted i { color: var(--bs-user-level) !important; }This then yields
3f072f8a-ebfa-4910-8723-73c493b8e4eb-image.png
However, the caveat here is that the .upvoted class will only show for your upvotes, and nobody else’s. However, this does satisfy the original request
however I would love to see my upvoted posts more clearly, because currently, when I upvote, nothing on the post tool is changing, it would be nicer if there is an indication that I have upvoted (like a filled or colored triangle?)