I use nano on my headless servers through Windows Terminal.
I just tried out the dte editor which in current beta now support the ability to copy selected text right back to your host Windows clipboard. A really useful feature that I after a few days just can't live without.
Perhaps you could consider adding this feature to nano :-)
If you want to try it out yourself in dte you need to enable the feature this way:
echo "bind -n ^c 'copy -bi'" >> /root/.dte/rc