I think you're problem is compile time, (e.g the namespaces are not there,) so if you have something tempory in v14 you have to make sure that isn't there at all when you move to v15. you could potentially do this with targeting the .net version (e.g have a package that compiles a .net 8 and .net 9 dll, with the .net 8 dll haveing the fallback stuff in it. the remove the models and build is a 'better' solution, but persronally i don't think that should be the solution it should build no modification and migrate for you on startup.