I've wanted to do the same, for a long time. But, there are just too many issues.
Although i truly admire photographers who have committed to one format, one lens, one film, etc, i simply am not that type of person. Most of my favorite photographers are one lens guys, essentially, or at least they are in the bodies of work that i most admire. Avedon, Penn, Koudelka, Erwitt, Levitt.... But, then there are the people like Steven Meisel, Steve McCurry, Patrick Demarchelier - who use various tools, depending on whim or necessity. Two types of people. I don't think you can fight who you really are.
You seem like the type of person who enjoys gear. As much as many forum members would like you to feel guilty about that, it's not a sin or a vice. I'm learning to accept that. I feel guilty for having a Canon dSLR, Hasselblad, Ikon rangefinder, Nikon slr, Contax slr.... But, i LIKE all of those pieces, for various reasons. And, i would feel a compromise if i let any of them go, even if i don't particularly use them all 'enough.'
But, i do buy and sell pieces, kits, and systems with too much regularity. The promise i made to myself three years ago, though, was to not buy MORE gear than i already had, and not to spend MORE money. Whatever i do should come from an equal or plus $ transaction. And, the effort should still be toward simplifying everything.
Here's a suggestion. Don't sell anything, except possibly the duplicated/redundant pieces. Keep one of the 35mm lenses. You may want to also choose between the 28 and the 35 instead of keeping both. Whatever you keep, though, choose one lens and pack the others in a box, sealed, and stored somewhere in your house. Out of sight, and too much hassle to retrieve.... If, after six months or a year, you don't miss it, then you can sell. it's not as if the market is devaluing rangefinder lenses.
If, like me, though, you are attracted to too many different types of photography, you may find you want more than just the one lens. It seems like every week i begin to like something else, and i want to try it for myself. Where i used to have no interest in wides, all of a sudden this month i need to experiment with a 28mm. All because i saw something i liked and i found a new appreciation for it. Some people, though, like ONE THING only. Like those who, when asked What kind of music do you like...they have a one word response. I typically have to say, ALL types, except one or two.... And, then i have to clarify...that sometimes i do like those one or two other types. Photography is no different. And anything i don't like now, i'm bound to find an appreciation for soon. And, whatever i like, i need to try to accomplish myself.
It's a difficult set of characteristics, and i agree that those with singular interests have an easier time 'focusing' on accomplishing a singular task. But, my personality doesn't allow me to dismiss the other interests.
