My experience is that in the era of great tubeless compatible rims, for CX in particular it's not worth messing with conversions of non compatible rims. The one time I tried ages ago my tire dismounted mid race causing me to crash and have to run the rest of the lap to finish DFL.
130mm fix/free rim brake is a pretty rare spec, but any decent wheel builder should be able to build you something reasonable. You can either have your existing wheels unlaced and rebuilt with new rims, or there are some good options in 130 fixed/free including All City Hubs and Surly Ultra New hubs. You can also use a cup/cone track hub if you replace the axle with a longer one and add spacers. Any wider tubeless compatible road rim is reasonable for CX. Still, this would cost in the region of $300 at a minimum.