Should turn out ok. It might not totally clear (if you were intending clear cider) because, depending on the heat, it may have the set the pectin in that half gallon portion (which occurs at about 180*) ... but hey, that’s certainly not a problem.
BTW, I would never boil cider as it changes the flavor.
I’ve never used malt or maltodextrin in cider ... sounds interesting tho.
My main use for maltodextrin is in a bizarre ale I sometimes make that does not use malt but instead uses “manglewurzels” ... which is an ancient, giant ancestor of the beet, known in the 1700’s as the “root of scarcity” ... (it’s a Jacob Marley thing ya know). I do add maltodextrin to that. I digress.
As far as the yeast, Nottingham is a version of the yeast Saccharomyces cerevisiae which is, in fact, the strain known as “killer yeast” because it secretes a toxin which allows it to overpower other yeasts. However I do not know whether nottingham is like it’s fearsome, bare-knuckled cousin K1-V1116 ... or whether the nottingham version is a gentler, milder version of Saccharomyces cerevisiae. If I had to guess, I’d say that you will be ok verses the wild yeasts.
Other than that, I’d say that strict sanitation and limiting oxygen exposure are important with the raw unpasteurized cider ... but that goes for all fermenting processes anyway.