Them arrows come with the 2 part epoxy, a plastic insert tool, a little pink round grinding stone, and aluminum inserts.
$75 a dozen is Camofire sale range pricing for bare shafts. That would have been a deal had they been untouched.
Like was said, you can try installing a large(long) steel field point and heating it slowly allowing the heat to transfer to the aluminum insert. This may work, but maybe not. Havent tried on an epoxy installed insert.
At 30" if you cut maybe 2" off you'll likely cut off the insert if a 28" arrow works for you.
Or flip them around. The insert is probably in far enough for the nock to fit fine. If so you would have a little extra weight (16 grains) in the rear, but could likely tune for it.
If you need the epoxy, stone, insert tool kit hit up a local pro shop. They seem to often have them laying around or for sale. After a few years you'll have your own collection of little green tools and pink stones.