In terms of "slowing down," which really means "more quality time," we have discussed early use of mobility devices, BiPAP, feeding tube, an advanced hospital bed, staying social and in nature, consuming music and the arts, assistive communication, real-food nutrition (including tube feeds), adapting your work if possible, etc.
These may all seem tame and boring but few PALS max them out and they have real impact.
Nuedexta is currently marketed for ALS, so it's not "alternative." Tamoxifen is an anti-cancer drug that is no longer being explored in ALS. I won't go through the whole list above, AHL, except to say if you got it from browsing ALS Untangled, that's a very skewed view because their review portfolio is based on crowdsourced requests rather than merit.
In addition, most of the agents listed above would need careful consideration beyond their effects on a random PALS, to someone with a seizure disorder, and most trials of anything but anti-epileptics will be closed to someone with your history, Puyallup.
Fortunately, clinical trials, the majority of which fail, are not the only or best pathway to alternative treatments, which if you take a broad view of the term as I do, are plentiful and only hinted at by the first paragraph of this post.
The same means that extend lives in other terminal conditions have extended far more PALS' lives than semi-random dice rolls.
Sure, most everyone tries something off the beaten path, finding their own happy medium with that. Just bear in mind, the considerable time some PALS spend chasing/using/paying for/metabolizing a miracle cocktail, often with self-canceling or counterproductive combinations, is generally wasted.