If you do not mind two shortcuts instead of one, then
can ease up copying coordinates like this:
while photo selected hit CTRL + E (alternatively right click and select Edit Data)
select either Decimal or Sexagesimal value and you are free to CTRL + C
As a bonus (if you are applying image data to another file), you can copy the whole image data ...
https://www.digikam.org/, might be overkill, but this FOSS app has everything under the sun for photo management (including facial recognition, database and metadata sync) as well as geo-tagging.
More light-weight options (also FOSS) dedicated to handle GeoLocations in photos could be on of these: