Why the requirement to have both hands on the wheel? Also there would have to be some range in the brake operation, not just an on or off like is most likely present in the stalk.
The closest thing that comes to my mind is one of the knobs/pegs on the wheel and a hand lever with the gas and brake on it. I saw a setup similar to this on tv before. A quick search wouldn't pull it up though.
Edit:
Like this, except instead of a clutch cable a throttle cable. The handle is connected to a relocated master cylinder (or a series of linkages)
https://www.jegs.com/i/TCI/890/61800...saAoTBEALw_wcB
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1973 Fiat 124 Special
1975 Honda Civic CVCC 4spd
1981 Kawasaki KZ750E
1981 Kawasaki KZ650 CSR
1983 Kawasaki KZ1100-A3
1986 Nissan 300zx Turbo 5 spd
1995 Chevy Astro RWD (current project)
1995 Mercury Tracer
2017 Kawasaki VersysX 300
2022 Corolla Hatchback 6MT
https://www.youtube.com/channel/UC6s...LulDUQ8HMj5VKA