How to mass Flip cards in a deck? Copy Deck > Reverse > Import?

Hello, I have been going through the forums trying to find a solution to this but nothing seems to work. I am learning German as an English speaker and use Anki for vocabulary. First of all I have one big deck for all my vocabulary which has English at the front and the other side is in the German. I would like to duplicate this deck so that I have two of the same exact copies and then on the duplicated deck flip all the cards so that the German words are on the front and the English words are on the back of the card and after that I want to merge both decks into one so I can have normal and reversed cards in one deck.

is there a simpler way where anki also just shows normal and reversed version of card?