The short answer is that nothing built into ClearPass will fulfill this entire workflow.
That being said, ClearPass is just hosting a web page, which with proper Javascript (which I do not know) it can extract data from your redirect URL. For it to extract that data, the data will need to be in the URL - for example. In CRM, when it generates the link to be sent. We can see this functionality with auto-populate MAC address for device registration. The MAC has to exist in the URL for it to extract that data and auto fill it.
A few things need to happen to complete this:
1. CRM link must include everything to be auto-filled
2. Javascript must be written on the page to identify and extract that data to fill
The rest of the workflow I believe ClearPass handles natively. - Sending confirmation email and also showing receipt page, which can be customized to only show username and password.