Something like this may be suitable and retain some sort of originality:
https://www.ebay.co.uk/itm/196879369...Bk9SR-Cf3KuTZg
I prefer hex head to Pozi for threads that will be quite tight.
I try quite hard to keep the engine threads on the V8s UNF / UNC and the bodywork BSF / BSW. It keeps the tool count down and saves the next chap guessing. Hardly an issue with hinge bolts as they are rarely undone, but we all have different outlets for OCD.