Have you looked at
Hunslet Cemetery on Find a Grave recently? From the number of memorials it looks as if the whole register has been added and the additions all have plot numbers. Moreover, you can now search by plot number, so with some trial and error you may be able to find distinctive monuments near the one you're looking for which have photos or even GPS. You could also look for photos near the corners of the Yorkshireburialsuk map sections.
Go to the above link, scroll down to the Search area and click on "More search options" which gives you a Plot field (bottom right). Wildcards are available, but the default selects by prefix, so 123 will give you 123, 1230-1239, 12300-12399 etc.
Another trick I use for finding my way around cemeteries is to print out the list of military burials from the CWGC site, as the official gravestones stand out