Hey Shrek, you have two choices. Fight the HOA rules on the roof, but you'll have to hire a lawyer to write the court complaint, stating that none of the available contractors will install on a wood shake roof. It has to be a single complaint, you can't fight to allow a composite roof, then decide after to do the solar, the solar is the real argument here. It will cost money and time, and you have to decide if it's worth it. Don't try to "hide" the panels on the back side, in the end someone will find out and complain and when the HOA knows, they are bound by their own rules to make you follow theirs, nobody will 'let it slide.'
Second choice, and to be honest I like this one better, don't put the panels on the roof. They do actually detract to the appearance of the home, even if you like them and want to crow about your solar home. I have them here, my large array is on the garage roof, and the small one in the garden. I wish I had put them all in the garden the first time around. They are easier and cheaper to install, maintain, sweep snow and debris off of, and if for some reason in the future your power output decays, as mine did once, it is so much easier to trouble shoot them at ground level. Nobody has to look at them, just keep them below the level of your fence.
If you're not sure where a good place to put them on the ground is, try this: Take a blank piece of paper and make a rough sketch of your lot, showing house, driveway, major trees, fences and such. Make 12 copies of your "map." At 9am on a day you are at home, go outside with a map and yellow highlighter, mark all the spots on the map that are getting sun in your yard. Mark that map 9am. Do the same with a second map at 10 am, and so on until 6pm that day. Then look at all the maps at the end of the day on the table, you'll see at a glance where your best sun is. Ours is at the back of the garden, and it actually looks quite nice there. I won't argue that you might get a little more exposure and therefore production on the roof, but consider all the negatives, the lawyers fees, court time, time waiting to install your roof, negative goodwill with the HOA, and some of your neighbors. You can replace any lost power production with an additional panel or two on your ground mounted array.
I have also seen some very nice back yard canopies that are covered by solar panels, at least one company even makes transparent panels for just such an application, I've put one link below to illustrate. All I'm suggesting is looking online at dozens of other solar arrays and see if you can get some ideas that don't require you to fight your HOA, and possibly upset your neighbors or even degrade the value of your home. To you and me, a solar powered home is a benefit, but it isn't to many people who might be looking to buy your home one day, you'd be surprised how people react to this technology even today. You might even be in a situation where you do sell your home in 10 years, and the contingency from the buyer is the seller must remove all solar equipment from the roof. If your array is in the yard, it would be so much easier to take it with you to your next home. Just make sure you're considering all the ramifications, not just how to get your panels on the roof. Take care Shrek, Rudydoo