le_neocon,
In many respects, I have a similar background (EE undergrad, CFA charterholder and banking experience). However, it seems that I am older than you. I have been talking HKS alumni and admissions staff about applying to the school, and the feedback is very positive. So I would say that you stand a good chance (given you GRE scores and quant background), if you can persuade Adcoms that you have a genuine interest in the public sector. Full disclosure: I am interested in HKS's Mid career program, and I don't know how much more stringent the admission criteria for the other HKS programs may be.
Hope this helps.