Make a group from strips of metal first and get the profile down pat before ordering a waterjet run. Posting the blade profile here may be a good idea, as we may see something that you don't.
Just to give some food for thought, unless you think you will be selling hundreds of these, waterjet is going to make then expensive. It would be best to get the steel supplier to cut strips in the width you need and shape then on the grinder.
Here is what I do:
Take the strips or 3/4" wide metal and cut i to 6" long pieces - 10 seconds per blade)
grind the 2" tang on the flat platen with a 50 grit belt. I usually take about 3/16" off each side, which leaves a roughly 3/8" wide tang - about 30 seconds a blade.
On the same belt, shape the tip - 10 to 15 seconds.
Bend the tip 3/4" back from the point on a bent-tip blade.
It takes a total of less than a minute per blade to shape them by hand.
I HT in batches of blades. I use 1950°F for AEB-L. I do about 20-30 blades at a time, or send a batch of 100 to a commercial HTer.
I put 5-10 blades in each foil packet (for AEB-L) and when I take them out I cut the end off the packet and spread them out on my aluminum quench plates, then clamp down. A couple minutes in the plates is long enough. Then, I open the next packet and do it again, etc. I dump the blades in a bucket of water to cool down as I take them off the quench plates. Then the whole batch goes in a dry-ice/alcohol bath for an hour or so. ( I usually just leave them there until the DI is evaporated.)
I temper at 400°F - two cycles, one hour per cycle.
This regime gives a very tough oyster knife blade around Rc59.
