I think yogurt + peaches with oats is definitely something that sounds delicious; I bet cottage cheese would also work really well and would boost the protein (and is a relatively affordable form of protein).
I wouldn’t like the dairy part of this for ethical reasons, but it’s an easy way to boost the protein, as long as you can find an affordable source of it - which I think isn’t too unreasonable in the US (the US has major subsidies on dairy products, so they can be pretty cheap despite how expensive dairy farms are to operate).
I wonder if by “soy PVT” you maybe mean soy TVP - that is, textured vegetable protein? I’m not sure what soy PVT means otherwise.
I’m not sure how I would feel about TVP in my yogurt cereal breakfast - it is a cheap source of protein that I use in a lot of foods (yay for TVP!), but it’s so chewy and like meat, I think I might find it off-putting in breakfast cereal - but I haven’t tried it, so maybe it would be good (esp. a really small / fine TVP).
The oats, flax seeds, and fruit all provide good sources of fiber, too - looks really good!
If you wanted to make it more fancy, you could take the dry oatmeal and roast it, maybe make a granola in the oven with some honey and nuts, etc. - it might add a nice crunchy texture to the dish (instead of soaking and adding more of a “mush” or mash to the dish).
Do you know how much a bowl costs, and how many kcal and grams of protein there are? That’s something I would be curious about, esp. when comparing to the dishes I make now.