Without the manufacturer's prior approval it is an OSHA violation.
As Normady pointed out, some products like "lift-n-tow" from star manufacturing, work OK. We have one but it has no bolt to tighten onto the blades to keep it from moving toward the truck, just a chain so it won't slide off the end.
Often, a heavy "roundsling" chocker'd around both blades together can give good vertical lift safely.
Is that an OSHA approved method?
They say no.