I've no clue about VST3, but with VST2, no, not only not an easy way, but just no way.
Every VST2 which properly supports soundbanks (*.fxb files) can only load a single soundbank into its memory. So does also Viper.
May I suggest to try VeeSTeeEx to wrap the VST2 version of it?
The main purpose of this wrapper is to add presets (and banks) management to any wrapped VST2 and give you super easy access to ALL presets available for a VST2.
E.g. for my demo version of Viper I've 14.721 presets easily to chose from.
Probably not super-easy to set up (one needs to read the manual - at least the first page),
but once done and banks and presets have been imported, you'll have all the imported banks and presets quickly available.
https://www.kvraudio.com/product/veeste ... roductions
Edit:
And yes, with VeeSTeeEx you can import multiple soundbanks at once.

