Power Supplies

Usually the feedback path is layout-critical to avoid picking up noise, a workable approach might be to design in a small digipot into the PCB from scratch. Trying to camp-on to an existing circuit with external circuitry in the feedback path could have issues (try it, but don't be too surprised if it fails...)

As mentioned above any decoupled reference signal is amenable to being provided remotely. The base of a resistive divider could be turned into a reference for instance, if well decoupled right at the chip.