But it is acceleration that must be "compensated", not velocity;
Apology, pardon my French, brain drain, drive-by, fast brain slow typing, editing snafu's, etc.
Whatever; it is not a different mechanism, because the drive is working exactly the same as it does when accelerating, the only difference is the direction that the ship is facing. There is no need for different size tractor beams on the spider drive ship, just as there are not different wedges used to decelerate rather than accelerate.
Process? Whatever. Flipping the ship is a process. BTW, how much time does it take to flip? Does it vary for each class of ship?
As an aside, it bugs me that a ship with a wedge has to flip to slow down; because that was not true of square rigged ships which could back sails ("Old Ironsides" did this in the midst of a battle to get an advantage).
I hate that it has to flip too, but with no force to push against . . .
OTOH, I was rather looking forward to seeing it in the movie.