It would be an awesome idea to be able to create a Virtual Card linked to a newly created envelope as needed. Routing and account numbers are good, but having the option to create a virtual debit card is even better. The 1ONE card from One, Finance has this ability.
reach out to Privacy.com. when i used envel i reached out to privacy.com and told them i need to verify with account and routing numbers they gave me access.
I also have Envel Integrated with privacy.com
And if I need to do ACH deposits we also might be able to use Plastiq.com.