The problem with converting OEM alternators to external regulation is that if the regulator isn't programmed to go easy on the field strength, or the alternator isn't fitted with temperature control, it can quickly overheat and fry it. Quickly being a matter of minutes. Maybe more than a couple, but it doesn't take long at full field. They just aren't built for that kind of service. Temperature monitoring will prevent that, worth the extra $$ and effort to implement.
I'm not sure I'd trust a shop that says that external regulation isn't possible. It's not rocket science.
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