You won't charge for a row backwards, that's about as ridiculous as charging for the front row. Just won't happen.
And as I don't know how Swarm's station is laid out, and from what I have read on here it seems like there is a front row queue, so why not (and this may require too much common sense) but if someone requests a back row, have them wait and send people through, like most parks I have been to have done when assigning seats and someone requests a certain row. Disney does it Cedar Point does it, SFMM did it for X2. It's just not that complicated.