Not OP but check out this (1) thread from yesterday . balloonary (2) is mentioned as a solution to quickly launch a sign up page. Here (3) is an example of how that would look like.

1.https://www.reddit.com/r/Entrepreneur/comments/ig9csz/is_the...

2.https://balloonary.io/

3.https://rent-a-cat.blnry.com/zxz