Just making sure I dont shoot myself in the foot further down the line. The wear foundation is additive to the regular one, meaning that Id be fine bringing the regular foundation into my wear integration, while also depending on and making use of the wear specific one to support curved modifiers, etc?

Yes, wear foundation is addictive, only material and navigation have to be replaced, see https://developer.android.com/codelabs/compose-for-wear-os#2