All you need to do to be legal (and work) is get married. If your "prometida" won't marry you now, what is she waiting for...to see how much money you can make before she does?
Getting "around the system" is not likely, even if you had the money to pay a "lawyer" (which you apparently don't and could get a letter from "an accountant" and have the signature notarized (thereby making it eligible for the seal of the Apostille), would you really want to submit "false"documents to migraciones? They might ask for your (original) supporting bank statements as well...
When you say you are a "self employed" dental tech who needs to find "work" do you mean as an independent contractor? I am not sure, but I seriously doubt anyone would simply let you work independently in a clinic here. I also imagine there are plenty of nationals who are qualified dental techs, so getting a work visa as one is also unlikely.
Even if you were married to an Argentine and could legally work, have you researched what you would have to do for your "credentials" as a dental tech to be accepted here?
Having been in one sided relationships several times in my life, especially when the woman I was dating resented making more than I was at the time (doctors are like that), I suggest you consider how strongly you love is being returned. One thing I know for sure: women test men, and it sounds like this may be your final exam as far as your prometida is concerned.