Sharing Custom app with Customer

Hey all,

I am a developer currently making a small app for a customer. I have a quest with developer account and would like to send the app to the customer's quest 2 without them having a developer account. What would the best way to do this? I've seen sideloading and app lab as an option but I would like to keep the amount of steps the customer has to take to the smallest as possible and this app does not need any verification as it is private.

Is there any other way or should I go for the app lab route?

Kind regards, 

Chris