One possible workaround would be to use API calls to push data into Marketo immediately. To make API calls into Marketo, you'll need to do the following
From there, you will be able to create API calls from your CRM and access API endpoints with this user to make updates in Marketo. This method can also be used to sync data between Marketo and unsupported or custom CRMs.
Note: You will need to work with a developer to create the API calls. Marketo Support are not trained as developers, so if you need assistance creating your API calls, you will need to work with Marketo Professional Services instead.