You should get a 1075 carbon steel Tramontina machete for like 12ish dollars. They're true quality for the price, budget but good. Better than my China-steel Fiskars by a sight, you know?
You can indeed re-treat steel. I haven't the slightest how, but I would imagine those who could do it would still tell you to get a Tramontina just so you can have something "budget" and not "cheap". Stuff is liable to break and snap and go back towards your face if you do it wrong, so don't risk it with a machete, re-treating.... do you have experience doing that? If you are asking if it can be done, probably have not re-heated.
I know that stuff has different temperatures and times when treating, and that you should follow it. I don't know how you'd go about treating mystery steel.
Yeah, something in my gut tells me that it is not a good idea, except as a "fun project" that you treat very carefully, and that you should buy a Tramontina. It is like a machete equivalent to an Opinel (or, more properly, an MAM, huh?)
(p.s - I know it is a basic alloy steel, but I have heard about 1095, not 1075, what Trams are made of, that it can be finicky to heat-treat. This is a quote from heat-treaters by a guy who knows nothing about heat treatment, take with a grain of salt, and then another teaspoon, because this is about 1095, no idea if 1075 acts different in the oven, someone will tell you I am sure if you want to go this route, which you should if you value cash)