Duly noted but I'm not suggesting a solution for everyone. This is an isolated case or one off. It seems this person can't return the bow. If that's the case I'd pony up the cash and have the arrows re-flteched. Otherwise, buyer beware with HyperFlite.Your idea is good but greatly ups the cost of an arrow that doesn't work as is.
Suppose this person does not have a fletching jig, glue and vanes = more $$$.
Carefully trim the cock vane to obtain the proper clearance.
Now make a pattern from thin card board or card stock.
Trim all the other vanes to match. This will keep the arrow in balance, flight wise
even though the vane area will be a bit lighter than the original.
Wishing you all the best.