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I am quite excited by this… the Macbook Pro that is displaying the installer is officially only supported by Big Sur, OpenCore Legacy Patcher has configured a Ventura install. The hardware was bought to provide a donor screen to a more recent Macbook & this is a useful ‘sandbox’ unit for testing, experimenting, and so on.
Given some knowledge of the MacOS directory services I likely could have simply modified group membership, that might come later.
While intermittently cursing MacOS’ obfuscation of something analagous to other *nixes ‘single user mode’, my realisation that recovery mode affords, practically, the same thing has been a useful learning point.
I hit a snag after the OpenCore upgrade to Ventura. Somehow, the ‘admin’ privileges previously attributed to my user had been rescinded.
Booting OCLP recovery is at present (v1.3.0) non-functional so I used my Big Sur install media to get a ‘terminal’ & delete the AppleSetupDone file off the system volume thus enabling me to rerun local machine setup & create a new user with admin privileges.