Primary / secondary Switch accounts

My wife and I both own Switches. My account is set up on both Switches to purchase things. My account on my Switch is considered the primary and on my wife's Switch it's considered the secondary. I understand the rules for who can run what on primary and secondary Switches.

The problem is with new Animal Crossing DLC. We have two Animal Crossing cartridges (so we can play together). I purchased and downloaded the DLC on my Switch and downloaded it to my wife's Switch. My wife must be online to access the DLC on her Switch. I understand that this is how it is supposed to work.

This is a problem during the day as we only have one available network connection which I use for work. She can't use the DLC on her island on her Switch. We do not use wi-fi.

MY QUESTION: If I make it possible for my wife to purchase things on her Switch and she purchases the DLC, will this remove the you-must-be-online requirement?

In my head it will work: her Switch will be considered the primary for her account and (based on the rules), everybody will be able to access the DLC (like they can do on my Switch--my daughter accesses my island from her account on my Switch).

Solution 1:

On my wife's Switch I set up her user with a Nintendo account. I then verified that the Nintendo account had her Switch flagged as the primary. Finally, I purchased the Animal Crossing DLC with her account. She can now access the new DLC without being connected to the internet.