Well, most Japanese base models have cable actuated heat valves. The cores are pretty small, too, but if you can braze, you can cut one down on your own to fit. The snake hoses are going to be a problem, most likely.
I still intend to try this some day on something. Eventually.
__________________
"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"