I'd probably wire it up to make use of the low speed, then set the VFD to allow a higher frequency to get the high speed back.
With the correct VFD, you can configure it to allow the use of a Jog button.


Out of the three boost VFDs I have, one runs my rotary converter, one runs a basic saw, and the other is destined for my big mill which is very slowly getting bits added to it, but will likely be getting controlled via ModBus.