I have no [copulat]ing idea what you are describing (and probably you don't know clearly what you are describing either).
USD= JANE "debit to" JOHN "debit to" XXXX
GEC= STEWART "credit to" JOHN "debit to" NULLDATA
Since you can't even explain clearly, then you have no hope whatsoever with your coin. If I can't understand, you can be sure the majority of folks won't understand.
I have no idea what you are describing. All I can surmise is Jane pays fiat to John for walking her dogs. John gives the fiat to Stewart in exchange for GEC. If that is not the case, you will need to explain your gibberish in the English language. I have no idea what you meant by:
When John spends the fiat currency he acquired from Jane, he could then spend the GEC he acquired from Stewart in an unspendable transaction - removing it from his economy.
You are wasting my time. In every professional situation I have worked in my life, if someone couldn't explain something clearly the first time (or at least not exhibit an apathy towards trying to be clear), they were thereafter ignored (and fired!).