How boxed in is cosmology by the cosmological principle? If we - as an example - didn't assume the cosmological constant was constant and expected it to vary over large distances, could we arrive at a working model of the universe? maybe high density dark matter/energy regions are the same as regions of high/low values of the CC. It's late.
edit; did some digging - looks like its actually and active area: https://www.scirp.org/journal/paperinformation?paperid=13446...