The research-oriented master's like MPhil Oxford will likely reject you; they're more selective programs that tend to expect students to do some research by the end of the degree, and you're simply too far behind in coursework for that to be feasible. Non-research oriented master's may accept you (without funding), but keep in mind that they naturally don't place well into PhD econ programs. Exceptions exist for those who do exceptionally well, but again, it's really hard to predict your aptitude for the subject given that you have essentially no formal exposure. Even top math majors sometimes switch to econ and find it immensely confusing (or uninteresting). That said, a master's in econ is probably your only option, and I think you have a decent list. Just be mindful that this is a very uncertain path and it may take more years than you expect to build up a profile that's competitive for econ PhD admissions. You certainly won't get admitted in any econ program if you apply in the first year of a master's program before any course grades in econ coursework exist.