Brad,
I doubt you'll find that consensus. Dietary/supplement intake rarely translates 1:1 into cellular supply, access or movement of a given mineral, hormone or compound. And what we think we know often maps back to blood levels, which can only reflect 1-2% of circulating levels. So reading up on possible biochem mechanisms (that in themselves reflect a series of environmental as well as system triggers) to pick pills and liquids to ingest is highly speculative, though most of us have done it.
Re the DP, I'll only say that the measurement error around this process is compounded when you have a long list of supplements and long-term exposure. To me, homegrowning it right means following the research and being thoughtful about your own history, diet, labs and symptoms, not grabbing a prefab list from...well, anyone. Truth is, most supplements can harm if your body is already well-stocked. It's often ratios, not absolute amounts, that are most important...look at the omegas, vitamins, electrolytes, hormones, so many things.
Just one example: dogmas like "vitamins prevent cancer" gave way to vitamin A, vitamin E and/or selenium supplementation may increase cancer risk, though we're pretty sure at the moment that maintaining certain levels of vitamin D is good. And the DPers handing someone who lives on ice cream and has no movement the same list as someone who walks every day and eats sandwiches is just silly. Not to mention that the body in distress is even less likely to process a boatload of chemicals in an optimal or predictable manner.
I'll say generally that like any healthy person you should monitor ratios of the Bs to each other, D and calcium, potassium/sodium/magnesium, monitor thyroid, adrenal and pituitary function; get your liver function tests done if you're on riluzole, eat "real food" rather than junk to keep your weight up, stuff like that. There may also be, depending on your personal circumstances, justification to try supplements like turmeric, fish oil, PQQ, cinnamon zeylanicum, ALA and such. These more likely ameliorate inflammation generally rather than providing any specific motor neuron support.
But all in all, having ALS gives you enough health issues to worry about, so one way to think about it that whatever you drink, eat and otherwise ingest that makes you stronger could help you live longer. And that rhymed to boot.