I think the standards for comparison in thin, light machetes are:
* Mora 333 machete (insulation knife) in 12C27 Sandvik stainless, 13 inch length, 7 oz weight, 0.60 inch thick.
* Friedrich Dick 60390300 machete (insulation knife) in X55CrMo14 High Carbon Stainless, 12 inch length, 6.8 oz weight, 0.94 inch thick.
* Svord Kiwi Machete in 15N20 high carbon, 12 inch length, 9.8 oz weight, 0.125 inch thick.
If the weight can be brought down with clever blade shaping like in the Svord Kiwi Machete or the Friedrick Dick machete, then a stronger and thicker blade can be used. The Mora is probably too thin, and there's no clever shaping. I should also point out that all of these blades only cost between $17 and $60 new. Maybe there is some way to push the price down to maybe $70 to $100. Perhaps a blade with a user-wrapped paracord handle could reduce the amount of work you have to put in make them, so you basically just focus on making the blade with a good heat treat protocol, and the user can design their own custom handle for it.
Another thing I fantasize about is a replaceable blade system. What if the majority of the blade were just lightweight aluminum, magnesium or even plastic scaffolding, and the exotic steel is a separate part that slides in? You could make a dovetail rail system pretty easily on a manual milling machine if the blade is perfectly straight. Curves will take some thinking, but maybe the whole front part of the blade where the belly curve is could be removable too.
There might be a way to do that with the entire blade edge, including the curve, with thin stock, if you get clever with lamination and sheet metal working. This might be possible to do very cheaply, if we count the cost of the replacement edges separately. Or maybe this is a bit too demanding, and we should stick with the formula that we know works, with normal 1-piece blades., in the normal thickness you're already using. Maybe that's best, because if I want a cheap, abusable machete, I already have 3 of them

In that case, carry on!