Have you tried just going to the website https://ankiweb.net/decks/ and reviewing your cards there? It should work on any device with a browser including your RasberryPi.
I'd trust the system though. Typically once you get to the point where you won't see it for more than a year you're highly unlikely to forget the content anyway. Although it depends on what you're trying to learn. The default settings are optimised for learning Japanese.
This is why you should turn off showing time until you next see a card in preferences. Trust the algorithm.
Or, you can fire up the desktop card browser and reschedule all the cards in those decks—choose "return to the learning queue" so they pop up like new, or set some interval like, again, a month. Then you can do a “custom study” to work through the cards right away. (I haven't tried this method, though, so not sure it will work.)