Cushing,
You are looking at this as a business decision. Custom knives are not a business decision ( or there would be almost none of them) because custom knives are rarely done by a business. The people in the business of custom knives have to protect their "maker value". These are Randall and other "custom" knife factories.
If I had a customer ask for W2 katana at Rc65 I could make that. But, it would break at the first good impact or bad cut. Just making the customer sign a paper absolving me of any liability will not prevent the customer breaking the sword in a tatami cut and saying before all the onlookers, "Dang! I just paid Stacy $1000 to make this sword. What a piece of crap!" The only way to assure that situation does not happen is to not make the sword in the improper specifications. A little education of the optimal hardness and edge angle will instruct the customer for a better choice and a happier cutting result.
The average individual knifemaker who sells custom knives has his reputation at stake with every knife he hands over to the customer. Just telling the customer, or writing the problem down, won't make the issue any less of a problem. The way to deal with it is by EDUCATING the customer as to why one choice is bad and another is better. I have had requests to make knives from odd materials many times. Often the customer says, "Oh, I won't really be using the knife for anything." But that isn't a sufficient reason to make an inferior knife. I explain that I cam make the knife so it is both beautiful and usable with the right materials.
As to the OP's problem, you may not be aware of how poor of a handle material the new acrylic handle materials are. Watching FIF will give you an idea of how weak they are. They look amazing and grind/sand/polish easily ... but they wear down and get ugly with even minimal use. Breakage is so easy yo have to look at it sideways to avoid breaking the handle with t]your stare. I am constantly amazed that the knife suppliers sell so much of it and the internet is filled with the stuff. I have tried several types and brands, and haven't found one that I considered durable enough for a knife that will get used.
There are many laminates that look just as good and are much more durable.
I am currently experimenting with the pictorial laminates that can be had with any image you want ($100 bill, nudes, hunting scenes, etc.). The image goes all the way through the scale, so grinding and shaping keeps the same image view. I will see how the resin used in laminating these holds up to use.