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I would think a web page would be the simplest. Spin up a node JS or whatever server on your home network and serve up whatever you want.

this is above my pay grade techinically speaking - don't suppose you know of a guide to this sort of thing?

Don’t know about any complete guide. But tinkering with HTML and CSS can get you a long way.

See e.g. https://www.zeitverschiebung.net/en/clock-widget for how to embed a clock widget on a web page.

There's a lot of guides, and a lot of approaches to making a dynamic page like this. Do you have any programming experience? What languages?