Activate order on guest account

Oh wow, what a stunning module thank you! Increase in sales due to guest checkout.

Workflow

1. User creates order and completes payment as guest
2. New user gets created, perfect

Issue

The order does not get assigned to newly created user.

Solution

I looked in rules, but there is no 'after payment completion, activate order'.

Most appreciate any ideas on how to fix this 🌷