Pretty much you will not have too much luck with Touchwiz or Htc Sense. Personally, if I am on a bootloader unlockable variant of either, I'm just going to run a modded cm build. I get where you are coming from, though, as my phone is not themable by any other means. I like the stock Moto software, but I like everything themed. Unless you have write protection off and root at minimum, you will be hard-pressed to theme a stock rom. even then, you have to decompile systemui.apk, framework-res.apk and any apps you want themed, recompile them, sign them (using apk tool and the original apk) then make a zip with an updater-script pointing at what to replace where. then, you still have to have w/p off and a custom recovery to flash your mod zip. OEMs should get with the times and build in a theming option. talk about a way to make people excited about stock software. Either way, I personally am never buying another phone that there is not bootloader unlock for. if that means no more Motorola, then so be it. (I own and have owned 14 or so Moto droid variants.) Fortunately for you, someone has probably done what you want for your phone, you just might have to dig *or* find a themer/dev that will make what you want.
as much as I would like to see HK Theme come back, the changes in framework versus Xposed make it a nee ball of wax no one is working on. perhaps they simply can't. (not my area of expertise). I hear ya though. give me themes.