MOSFET trio/quartet viable option?
FETs have a positive temperature coefficient of resistance, so can be paralleled.  However, that just means one FET won't run away, take most of the current, and blow up.  It doesn't mean they will share the current equally.  There are some options:

Use a single FET and PWM.  Depending on the load, you may need a LC filter to smooth the pulses.

Another way to look at this is to use a switching power supply to make the desired voltage.  You'd be controlling the reference voltage input to the switcher.

Use BJTs with individual emitter resistors instead of FETs.  BJTs have a negative temperature coefficient of their saturation voltage, so can't be paralleled directly.  You get around this by giving each BJT its own emitter resistor.  If you're going to add a resistor and operate them out of saturation, BJTs are probably easier to use in this case due to the relatively tight range of B-E voltage.  The G-S voltage of FETs will vary more.