Donek Tools has a heavy-duty drag knife that uses standard utility blades…
https://donektools.com/product/d4-drag-knife/
Pretty pricey ($249 IIRC) but well made and able to cut thick (1/4") materials like coroplast and corrugated cardboard. The D4 model has a 1/4" shank that chucks up in 1/4" router collet.