The BC Restful API is not open yet to use on 3rd party systems - Oauth. When this is released you can start using it for 3rd party integrations.
the work around could be in the meantime to make mailchimp the hub list (or another support crm in zapier - zoho is free for low user number)
Then go BC > Mailchimp > Zap > Zapier supported CRM
Then go typeform > Zap > Zapier supported CRM
then go formstack > Zap > Zapier supported CRM
Use duplication tools in Zapier supported CRM to data manage perhaps
Did you investigate a BC <> Zapier integration any further, is it possible now? It would open up a world of opportunities...