I had mine done as follows:
Tooth drilled, root removed by emergency dentist. V temp patch up filling as crown.
Trips to nhs dentist afterwards for further drilling/ removal of the nerve to get it all out. (Unfortunately it went round a corner so some still left in – does flare up in a minor way if I’m really really run down once or twice a yr, it’s like a barometer for health!) would need further hospital treatment to get it all out, my choice to leave it.
Nhs dentist made up a solid longer term temp crown thing which has been good for a few yrs. most of the tooth was good so seems to do the trick. The issue will be if it crumbles or splits apart one day it’ll need filling off and a proper crown fitting.
All the above was nhs. Cost minimal and fairly quick, easy painless job as much as it can be (after the initial emergency treatment). I guess if I’d have gone private I’d have a perm fix and decent crown now.