Tom,
It's always a pleasure to hear from someone with a passion for the hobby. I will tell you a couple of things from my experience of writing a column for the past three years. You will not get much feedback from those who enjoy your column. You will get response from those who consider your thoughts to be out in left field. 
Bob Hunt told me at the VSC a couple of years ago "John, if you aren't making half the people mad...you aren't saying anything". My point is you will hear more from detractors than supporters. So as mentioned in earlier responses to your question, Thick skin is a nice thing to have. Da Dirt is the champ in this department and I read his stuff first. 
Each column takes on the personality of the author regardless of the the title. Doug Dahlke's "Beginning" is more about history and older planes though the Title might lead one to believe it is for Beginners. Sport Flyin' has a lot of contest and competitive stuff in it but I try to write from the perspective of a guy who flys pretty well but certainly not at the level of the the "Top Dogs".
Your thoughts about topics are very good. Most of us who write have been in this so long that we tend to forget the things that gave us problems when we were just starting out. As a result, what is in the flight box, is the tank clean, is the prop balanced (close), etc. we just take for granted and assume "everyone" knows these things!
An alternate solution would be to communicate with an established columnist and have your input included in his column. Sort of a way to "test the waters", so to speak. 
Jump on board! It's a fun ride!
Later,John