Faster Credentials Email

We're looking to offer a passwordless website login via an emailed token. The REST API has a SendCredentials method for generating a credentials email, but the recommendation from Tessitura has been to set email frequency to every 5 minutes. From a UX perspective, a 5 minute wait time (or even the minimum 1 minute) is too long for a purchase path login.

One option to speed this up would be to have the website use its own SMTP server to send a token email instead of TPS. We are able to use CRM/WebLogins/{loginId}/LoginCredentials to retrieve a generated token. However, we found that it stays null until calling SendCredentials, which attempts to send its own email. So we have two questions:

1. Is there a way to have Tessitura send credentials emails immediately, rather than waiting for the recommended 5 minutes (or 1 minute minimum)
2. If not, is there a good way to generate the token without Tessitura also sending an email?