I migrated to ClassicPress last year and created ClassicPress versions of all of my plugins. This wasn;t just a case of creating an alternate versions, but extensively rewriting them in order to both add new functionality and to improve their security.
I've recently made changes to them all again to further improve them. If you use any of my plugins list on my Development site, you should download and install the latest version.
ClassicPress v2 is to include a Plugin Directory which is meant to be available in the second-half of 2020 which will mean automatic updates will then be available.