Now that you are sitting up and for sure read it again, one of the longest passages in the MC rules addresses steering in streamliners and only mentions handlebars.
While butterflies and cables have both been tried by some very experienced builders, they fail to work well in use.
The rules are hopefully designed to be as simple as can be so the interpretation is limited.
Experiences that got them there would fill several books.
It should never hurt to ask because your new ideas may already have been tried with either success or failure.
The rules should evolve with those inputs but remain simple enough for Everybody to understand equally.
The car stuff gets pretty good . widespread, and prompt attention but the bikes are not as lucky.
TOUGH JOB !!!