Ayy 3 year Singed main here, and I completely agree. The whole mad chemist part falls into his (uncanon) lore. I do agree we need a Zaun champion that could pull off the chemist look better, or atleast a actually good VU. (None of that lazy retexturing shit. )
I actually fiddled with a few fun concepts based off the Mad Scientist skin line, where I infused elements of Plague doctors into both Singed and Ziggs, mostly because I was cosplaying Plauge Knight at the time. I guess the new Singed skin already did that though.
Actually thinking about it, an alchemy champion would be really cool as a support. Their kit can have a lot of utility through their brews, passive gold income, and DPS and or burst damage from chemical bombs. Their kit can work a lot like Rumble's heat and work as gas pressure, the less you use abilities the more pressure builds up, super charging the next spell. Holy shit I think we struck gold. Pun intended.