You could have a secondary owner fields and build views off that.
Secondary owner first name, secondary owner last name, secondary owner email address.
It could honestly be any field, even one called BDR, and then have your BDR's fill populate that field, or you can do it in batch.
Happy to brainstorm more if you'd like.
Not sure if this will help, but we use a sales automation platform which allows our sales team to put prospects into templates. There is also a way in the sales automation platform to create a trigger that automatically places a prospect into a template or email based on a specific action.
Best of luck!