As much as I LOATH ZD542, I kinda concur. :-) If you're going "music speakers", and focusing on improving 2 ch, then you should go dedicated 2 ch amp/pre and maybe separate the two systems for maximum.
For one, the Theils 2.7's are gunna be too laid back to properly do justice to HT, in my opinion (I've had 3.6's 2.3's, MC1's, 1.5's and 2.3's in my systems over the years).
If I had to go Thiels for double duties, I'd probably lean the powered monitors they sell, or maybe 1.6's in passive.- you want more presence from your ht system, or you'll lean into the sound, which isn't thrilling or involving for proper HT, IME.
Still, I'd go dedicated movie speakers for the HT, if I could...maybe running a pair of your preferred 2 ch speakers in conjunction with looped in AV pre/pro (you're processor is likely fine), running a 5.1 ch dedicated HT monitor system and sub for movies.
I think this topic has be exhaustively covered over the years.