Help with renewing Game Pass Ultimate subscription?

So I used the $1 deal for Xbox's Game Pass Ultimate (GPU) last year and transformed a year of Gold into GPU. My subscription is about to expire. 

Is it possible to let it expire then buy a year of Xbox Gold (I buy the cards) then use a Vanilla credit card to buy a moth of GPU, hopefully transforming the whole year into GPU again? Or is it possible to add a year of Gold before it expires and have it transform into GPU? I'm looking for the cheapest option if possible.

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