Yah, demographics is defined principally by the magazine that a series published in. That's by definition.
I feel that for the most part, the demographic actually does accurately capture the "feel" of a series (whatever that means). Magazines have editorial oversight who decide which series are a good fit and which ones aren't for their publication, so I think demographic classifications are more or less consistent with what most people expect them to be. There are a few outliers that don't really fit their label, of course, but I don't think they're that common. And I guess the very clear-cut unambiguous definition of "the magazine it's published in" is a good thing because then people don't get into edit wars.
But then of course there are manga has been published in multiple magazines with different demographics, there are magazines out there that are neither shounen, seinen, shoujo, nor josei (e.g. yuri magazines, children's magazines), there are series that aren't even published in magazines (e.g. doujinshi, Pixiv/Twitter comics), and so on ¯\_(ツ)_/¯
But anyway, back on topic, here are the ones with male MC POV that I know about!
Mint na Bokura: A middle school comedy romance shoujo manga, with some crossdressing shenanigans. I thought it was cute and fun to read. The POV focus here is Noel, and he really wants to go to the same school as his twin sister, but the school only had one vacancy in the girls' dormitory. So, Noel disguises himself as a girl to attend the school. (The headmaster is pretty easygoing, so she allowed it.)
Coda: A ballet-centric shoujo manga, also with some crossdressing shenanigans. The MC here is really good at ballet
Shounen Oujo: A josei manga. Political intrigue, twins and body double shenanigans, and more crossdressing. Also, dayyyyum, Theodore grows up so much after the timeskip >_<
Dadadadan: A slapstick comedy shoujo manga. Shiro is adorable <3
Ame Nochi Hare: A coming of age school life shoujo manga. It's about these 6 boys who enter high school and suddenly find themselves transforming into girls whenever it rains.
Kagerou Daze: This is either shoujo, josei, or shounen; not sure which (MU, MAL, and Wikipedia give conflicting information...) Based off of Jin's Vocaloid songs (the most famous of which happens to be called...
Kagerou Daze). Involves time loops, children with red eyes, supernatural powers, August 15, AND LOTS OF DYING (plz Jin I just want these kids to be happy).
Tsuzuki wa Mata Ashita: A really cute slice of life josei manga about a boy, his younger sister, their father, and their new neighbours who just moved in.
Pika Ichi: A school life drama shoujo manga with one of the more unique premises that I've seen. A female-male protagonist duo: The super-plain Suzuki Hanako, and the super-plain Suzuki Tarou. Gosh, what a transformation, those two. They're great, I love them.