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Doesn't sound like a good fit to me. Dark matter isn't distributed evenly throughout the Universe whereas an aether presumably would be (or at least a lot more so than dark matter).
How exactly is an assessment of the distribution of dark matter carried out?
it has not been quantifiable at all, with the exception of the gravitational effects that it exerts.
These gravitational effects seem to be fairly isotropic in nature
This statement deserves a qualification. The claim made for the distribution of Dark Matter through the Universe is based on the distribution of matter as indicated by the CMBR, (cosmic background Microwave Radiation) but this is not a very realistic way of describing Dark Matter distribution. The shape of a Galaxy does not really help in identifying which galaxies are shaped due to the presence of Dark Matter and which are not.
On the other hand, if as I had suggested, Dark Matter was in itself made up of infinitesimal electric dipoles of very low energy of about (10^-40 J) it would explain not only why Dark Matter has such low interaction with matter : no atom could possibly under any known circumstances, react with such low energies as 10^-40 J , it would also explain how and why Electromagnetic Radiation of all wave-lengths passes unobstructed through Dark Matter.
If your dark matter dipoles don't interact with electromagnetic radiation, then how is it at all relevant as a medium for the propagation of light?