I am currently working a SBS 2011 upgrade project. These versions with baked-in Exchange/Sharepoint appear to be problematic. As mentioned before, most organizations using this were small, under 50 users at any rate, so the time it takes to just create a new VM with Server 2022 Essentials, and then recreate all users and OUs, as opposed to try to upgrade is most likely the best and known conclusion. I am sure that one needs to remove the Exchange and Sharepoint roles and files before an upgrade to Server 2012 R2 is even possible. An upgrade would also most likely leave a lot of AD objects and attributes that are of no use.