Controlling max voltage (power supply) when Vin varies?
Switching regulators can go both ways

Switching regulators can not only step down the voltage (as in a buck converter), but can step up the voltage (a boost converter), or even regulate a voltage that may be above or below the output (you'd use either a four-switch buck-boost or a SEPIC converter for this).  (They can also invert the polarity of an input, but that's neither here nor there.)

Unfortunately, 9.2A is rather outside the range of a SEPIC as the SEPIC topology is capacitively coupled and you can't really get capacitors that can handle 9.2A of high frequency ripple current without heating up a bunch and causing other problems.  This leaves the four-switch topology as your primary option.  Furthermore, you'll need to use a controller and external power FETs at such high currents, as in the LTC3789 circuit depicted below: