Rather than cutting the outer bushing end and retro-fitting a HEIM joint, wouldn't it be a better idea to find one pre-made to replace it with and bag-n-tag the original for posterity?
Something like this would seem to be a bolt-on solution:
https://f1-fabrication.myshopi...-300e-e320-400e-500e
There are of course MANY other companies that make them for custom chassis builders.
Thoughts?
MH