What you need to be able to do is save/load an FXB file. Part of the VST spec. All figured out adequately by Steinberg 15+ years ago. Should be saved as part of the plugin instance state by the host. Works with all the hosts I've tried so far (haven't checked with Reaper, as I don't use it live.)
Do Reaper/JS plugIns have no analogue?
I would just recommend using VSTs then. Lots of free ones. But it seems silly that the Reaper plugs wouldn't have at least the equivalent technology to VST, being quite a bit more recent a standard.
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