Your road wheels are appropriate because they're what fits. You can't get something more appropriate without buying a new bike. If it works, it works, if it doesn't, you can get a custom wheelset or a new bike.

CX racing is in a weird place. Tubular tires are required due to the low pressures. Clinchers are virtually guaranteed to pinch flat and tubeless doesn't work because of the low volume tires. Tubeless CX tires are very prone "burping" and having the beads un-seat due to the combination of low-volume and very low pressure. Mountain bikes run similar pressures in tires with 2-3x the volume. Road tubeless works because of the higher pressures and reduced sideloads.

Mountain bike wheels would be great for CX, except the MTB community have moved almost exclusively to tubeless. That means there are basically two sources for tubular wheels, road wheels or custom wheels like psimet. Custom wheels are certainly superior, but there's a reliable supply of used road tubulars, so it's not surprising to see them used and abused. Especially since many CX racers also race road bikes, so last seasons road wheels become this season's CX wheels.