For now you can still bring back manifest v2 support (which re-enables ublock origin if you haven't removed it) by making registry changes. Obviously only a temporary solution, might buy you a few months.

Powershell commands to set them:

1. New-Item -Path "HKLM:\SOFTWARE\Policies\Google\Chrome" -Force

2. New-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Google\Chrome" -Name "ExtensionManifestV2Availability" -Value 2 -PropertyType DWORD -Force