If you are a dev you can fill a form to signup for pre-beta release update. It is approved at one on one basis for US and Korean based developers. Note that it is not a public beta and not all applicants get the approval.
Android Monthly security patch will be sent via Google Play Store in Android 11, so no need to depend on companies for that. + inbuilt Screen recording is coming with Android 11, so every M series user getting One UI 3.0 will finally get it.