Forgive me, Zangetsu, but none of those linked sources feel very credible to me. I have a very strong instinct to lump them in with the same ballpark of nonsense as the Time Cube site.
One making claims doesn't set the rule, and when he's taking quotes from notable alchemy practitioners literally, he's completely missing the point. The secret for creating the Philosopher's Stone was one shrouded in, as I have stated, multiple layers of metaphor and cryptic symbolism, and was never written literally.
That this Gardner guy seems to be quoting some of the big names at face value lends the impression that the greater scope and depth of the alchemic philosophies has escaped him entirely, as he seems primarily fixated on the "it makes gold" part rather than look at the Stone as a whole of what its successful creation signifies.
That and the sites themselves look sketchy as hell as far as credible information goes.
You said,
This was quite a few years ago via a few well known sources.
The references go as far back back to Ancient Egypt.
so why not just give me THOSE sources, rather than multiple pages from the same dude who doesn't appear to understand the greater picture of what he's talking about? If it's been a while and you can't remember precisely, that's one thing and totally fine, but giving me "sources" like the ones you have doesn't do much in lieu of convincing me of your point; just on principle it actually distances me further from what your point argues.
I do appreciate that you shared what you have, and some of the information is of varying accuracy (i.e. some quotes are correct, despite the shallow interpretations, etc.), though, so don't take this as any kind of attack or anything. I simply cannot bring myself to consider your point further with the information and sources you have provided thus far.
Also, in regards to the motorcycle thing: if it's just something Konami pulled out of their ass (which seems likely here) and/or wasn't clarified by IGA (who, whether you like him or not, has been the final word on most of the series canon), then I'm gonna have a hard time buying into it.