I struggled to find any guides for how to do this so I've written a blog post about how to use published results from global glacial isostatic adjustment models to derive time-series for sea-level change for any specific location (with Python or R): https://iroalkvam.com/posts/02gia_models/index.html
For people familiar with the topic this is likely basic stuff, and for others it might be a bit narrow, but it was a useful exercise.






