Convert waitlist leads into paying users (help!)

Hey folks, I'm looking for some inspiration on how we can convert 100+ of our "early access" waitlist members into paying beta users.

For the context, we launched our startup - Paperstack.ca - a few weeks ago, and by way of social media and earned media efforts managed to get some ~100 people to drop their email onto our waitlist.

Many of them even went on to fill out a Typeform with a few questions, which helped us tremendously in understanding folks who got attracted to our product.

Now, we feel the time is right to let a few of "early access" members into the world of Oz, to try our product 😉.

For the context, a the app we are building automates bookkeeping for busy freelancers. Signup steps would include 1) creating an account, 2) linking debit & credit card, 3) then waiting a few days for the report to arrive into the inbox.

Some steps are still conducted manually, and might not be intuitive from the get-go - hence the hesitation to send out a blast email with signup instructions. And then there is a "link you credit card" component. We also intend to charge a small amount (~$40) for 2 months of bookkeeping automation, as a "paid pilot".

What are some of the creative cool tactics we could use to let in a few waitlist members, and onboard them as private beta clients in this situation?