'Apps for SharePoint 2016 on premise vs SharePoint online help needed

Looking for advice/how-to - currently we have SharePoint on pre (2016) and a bunch of ancient farm-deployed SSOM apps that were done originally in SP 2010. We will be going to SharePoint online in a year or two, and the SSOM apps will no longer work. I'm planning on redesigning them and rewriting them into web apps and console apps using CSOM. My issue is, I'd like to use .net core for the apps, but CSOM .net core is not available for SharePoint on prem. So it seems I'll have to update the SSOM apps to CSOM .net framework apps, and will not be able to use .net core. Am I missing any alternatives? Is CSOM the best way to go here, even though I can't use .net core? Thanks!



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