I've been imagining & researching that AnCap society since 2009. There are literally hundreds of books by libertarian anarchists on how to smooth out those spots like jurisdictional law.

One very common theme is a system of Dispute Resolution companies called Assurance Agencies. Nothing like insurance, Assurance is a service that everyone who wants to participate in society subscribes to and it has your back during all justice-related situations. They'll read the law books for you. (But of course anarchist law books will never be even 0.01% as thick as today's statist law books...)

Fragmentation doesn't mean basic rights change, which should all be based upon the NAP in the first place.