is there any way to get the Garmin Epix Pro watch face on the 965?

This one comes pretty close:

https://apps.garmin.com/en-US/apps/ff0a8304-5e27-4f46-81e4-22f1a4e91df9

Im using that one , its great and very flexible regarding things that can be changed

I have it in black and white at the moment which looks like great to my eye.

thanks for the tip- I hadn't found that one in my search.  Looks pretty good.  I'll give it a go- see if it will display the data I like.  (body battery, next sunrise/sunset event time, calories, and a few others... depending)

Does it noticeably suck battery?

Looks like that designer, ManuelB, has pretty much recreated them all.  he's pretty good.  https://apps.garmin.com/en-US/developer/6436a326-9f3d-4e5d-a6c6-2ec8550bd37b/apps

I haven't noticed anything severe on the battery side , but I'm not monitoring it in detail.  I've found I can tailor to how I would like it quite easily and it allows a lot of customisation. Happy with it.

I can’t seem to customize the watch face.  I go to its settings on the watch, choose customize, change a data field, select Apply…. But it doesn’t seem to change anything.  I’m an idiot I guess.  

I did mine  on the IQ App, select My Device , Select My Watch Faces, select the watch face and go to Settings.

I believe you are supposed to now with the New IQ system be able to do IQ settings on the watch itself but it is a bit touch and go it seems

Thanks.  Customization works through the IQ app.  Just not on the watch.