Hi, I have a lot of very large maps generated from data. I find the map rendering really useful but the google maps thing is giving an annoying warning.
If you want to shift to using Leaflet.js it would be quite easy. I've a basic demo working here using your tiles:
https://www.southampton.ac.uk/~totl/mcmap/
Making the coords display, x,y,z fragments in the URL, full screen etc. shouldn't be very hard, and then you would not have to rely on google maps who tend to shift the goalposts now and then.