Alan,
I agree your model is novel but take care about selective interpretation bias, one of the biggest problems in astrophysics. I must admit as an astronomer I also cringe a lot when people quote wikiscience at me! Having said that I'll never dismiss ANY proposition out of hand.
There may well be some exotic DM within bodies, but the DM spread in the extended haloes (NOT in visible bodies) can not only account for all the gravitational effects on it's own (that's not to say it actually 'does', but also requires to be where it is to have the effects it does, NOT significantly within massive visible bodies, or even the 'dust'. The G potential of the bodies is well calculated, it's the 'other' potentials (not focussed locally on the bodies) that are most 'poorly understood'.
I have a current paper on galaxy evolution, including constraining DM, which has just passed peer review (subject to some minor improvements) which should go up on arXiv later this month. It rigorously derives the findings you suggest other causes for. I'll send you a link, IF you too have an open mind!.
It also identifies the reasons the DM and ionized gas haloes counter rotate ("kinetic decoupling") from the stellar disc.
In the interim another of many related papers I cite, giving the evidence it's happening not the solution;
">Decoupled gas kinematics in isolated S0 galaxies](https://arxiv.org/list/astro-ph/recent
Best wishes
Peter