No it's not - not with your glowplugs.
people make a big deal out of it but it's really not, it'll kick back against the starter a little if you let the GPs warm up a little, and it'll burn in the intake if you let the GPs get all the way hot. As an aside, it's how I used to tell when my 7.3's GPs were hot. Crank it 5 seconds foot to the floor, stop, then start running the GPs until you hear the gasoline in the fuel (you do run "garbage waste oil thinned with gasoline" fuel, right?) start making little "punks" in the cylinders, then start cranking again, let go of the GPs when it starts to catch a couple cylinders in a row 5-10 seconds of cranking later.
Just pull your boost gauge hose, little tiny pfft (you did swap the nozzle on the can with the brake cleaner one so you can use a straw, right?) blow it through the hose into the intake with your mouth, pop the hose back onto the gauge and crank it over. Hey presto, not walking home tonight.
it's when you're dumping half a can in there then cranking it that you run into cracked pistons, just come up on it little by little and listen for horrible noises. It'll let you know when you are using too much long before it'll hurt anything