I started wondering whether this breaks Roguelike-ness, since a run gets influenced by external factors.
It depends on your scale of dedication to exact definitions.
Holiday foods are deliberately designed to be nice subversions of pasty, but not something you would depend on (mostly due to rarity).
Dimensional Sundial is a reference to vanilla’s day and night differences, and could be seen as detrimental, depending on how you handle increased spawns. Also you choose to invest into it and don’t get it every time.