In case it's useful, some more reg keys

I had a similar idea to you and made a script at work a few months ago to make the default browser usable. Just in case it's useful, here's my Edgium Config.reg
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge]
"HubsSidebarEnabled"=dword:00000000
"AllowSurfGame"=dword:00000000
"AutofillCreditCardEnabled"=dword:00000000
"SmartScreenEnabled"=dword:00000000
"EdgeShoppingAssistantEnabled"=dword:00000000
"ShowMicrosoftRewards"=dword:00000000
"DownloadRestrictions"=dword:00000000
"PasswordMonitorAllowed"=dword:00000000
"AdsSettingForIntrusiveAdsSites"=dword:00000002
"EnterpriseModeSiteListManagerAllowed"=dword:00000001
"InternetExplorerIntegrationTestingAllowed"=dword:00000001
"AutoplayAllowed"=dword:00000000
"PersonalizationReportingEnabled"=dword:00000000
"UserFeedbackAllowed"=dword:00000000
"FamilySafetySettingsEnabled"=dword:00000000
"PaymentMethodQueryEnabled"=dword:00000000
"BingAdsSuppression"=dword:00000000
"ConfigureFriendlyURLFormat"=dword:00000001
"ComponentUpdatesEnabled"=dword:00000001
"PromotionalTabsEnabled"=dword:00000000
"AddressBarMicrosoftSearchInBingProviderEnabled"=dword:00000000
"WebWidgetAllowed"=dword:00000000
"WebCaptureEnabled"=dword:00000000
"NewTabPageHideDefaultTopSites"=dword:00000001
"NewTabPageContentEnabled"=dword:00000000
"NewTabPageAppLauncherEnabled"=dword:00000000
"AllowGamesMenu"=dword:00000000
"VisualSearchEnabled"=dword:00000000
"QuickSearchShowMiniMenu"=dword:00000000
"WebSelectEnabled"=dword:00000000
"WebWidgetIsEnabledOnStartup"=dword:00000000
"ShowAcrobatSubscriptionButton"=dword:00000000
"TyposquattingCheckerEnabled"=dword:00000000
"SiteSafetyServicesEnabled"=dword:00000000
"DiagnosticData"=dword:00000000
"EdgeDiscoverEnabled"=dword:00000000
"AlternateErrorPagesEnabled"=dword:00000000
"SpotlightExperiencesAndRecommendationsEnabled"=dword:00000000
"PasswordGeneratorEnabled"=dword:00000000
"AskBeforeCloseEnabled"=dword:00000000
"HomepageIsNewTabPage"=dword:00000000
"AllowWebContentOnNewTabPage"=dword:00000001
"StartupBoostEnabled"=dword:00000001
"CommandLineFlagSecurityWarningsEnabled"=dword:00000000
"DefaultSearchProviderContextMenuAccessAllowed"=dword:00000000
"AddressBarMicrosoftSearchInBingProviderEnabled"=dword:00000000
"DefaultNotificationsSetting"=dword:00000002

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge\ExtensionInstallAllowlist]

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge\ExtensionInstallBlocklist]
"oejmdnfdoeolakomanjkbmkeheflkmpp"=""

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge\Recommended]
"BackgroundModeEnabled"=dword:00000000
"SmartScreenForTrustedDownloadsEnabled"=dword:00000000
"SmartScreenPuaEnabled"=dword:00000000
"DefaultDownloadSecurity"=dword:00000000
"HomepageLocation"="https://my.favourite.homepage.com"
TheBobPony / MSEdgeTweaker

In case it's useful, some more reg keys #4
