Hello Jim,

You find yourself poised in an excellent position. First, your curiosity is evident in your questions. This means that you have ample force of will for learning more about the job. Second, your background is likely to be coveted by an investment management firm seeking to understand the industries you describe above. So, in answer to your questions:
1. I think in this instance your resume is going to communicate your background very well to a prospective employer. However, in order to cement this idea in the minds of someone that may want to hire you for your previous expertise it would be my advice to create one research report that makes tangible your previous experience(s). Once that is done your resume is going to do the talking for you. Then you can focus that curiosity on to learning the ins and outs of other industries and companies. Letting both your interest and ignorance guide you is a potent way to develop the important analysis skill set.

2. This is an excellent idea on your part. Seeking Alpha is read by many, and it may be possible that you find an audience there. SumZero is another site you may want to take a look at, as well as Thinknum.

Best wishes for success,

Jason