(1) may reduce the odds of bricking the device, but let's go with (2).

All OTAs can be found here https://github.com/QuestEscape/updates and https://cocaine.trade (lol).

If OEM unlock option is disabled on Developer Settings (hidden android settings can become visible with "adb shell settings put global development_settings_enabled 1" and https://m.apkpure.com/hidden-settings-for-android/com.jami.tool.hiddensetting) then have you already tried

(1) DownQuest https://github.com/basti564/DownQuest

(2) Flash unlock_token partition ("legitimate unlock") https://github.com/QuestEscape/research

(3) Telling Zuck you are making the first VR BTC HWW (lol) https://www.tradingview.com/news/tradingview:fc74aa984094b:0-meta-quest-os-open-to-third-parties/

(4) Shizuku + Setedit to manually set all oem setprops to 1 and then unlock both on Developer Settings and with fastboot?