One-Handed Wheel/Adapter for Futaba 4PX/4PM/7PX
I'm interested in either completely replacing the wheel, or adding an adapter, so as to allow one-handed driving when running my crawlers...but also retain two-handed ability when running FE boats & off-road race vehicles. I've seen the aluminum "clamp-style" adapters, which require the steering wheel foam to be removed, and then the adapter clamps into the wheel (in place of the foam). This is NOT what I'm interested in getting, as I want to retain the foam.
What I'm looking for is either a replacement wheel that has a built-in 'one-handed' lever (which also has the standard wheel foam)...or, an adapter that gets added behind the stock wheel. Do either/both of these exist? And, if so, can anyone lead me to where I can buy? I've searched the best I can and, so far, I've come up (no pun intended) empty-handed. Any guidance will be appreciated.