Grain to grain is not a waste of time. Using grain from one jar to colonize another will make the colonization time VERY fast.
There is only a big risk of contamination if your sterile procedures are flawed. Doing grain transfers in front of a flowhood or inside a glovebox/still-air box is very easily done without contamination.
Starting from spores is all good but not when you are trying to use a specific isolate. Multispore is for noobs. You could always use a liquid culture to innoculate grains , however in my experience liquid cultures contaminate easier than grain to grain.
Using a spoonful (tablespoon) of grain from a colonized jar to innoculate another jar, then shaking the jar real good after will ensure very fast colonization. Usually fast enough to beat out any contaminate spores that might have made their way into the new jar. I've had grain to grain transfers that have colonized a quart jar of barley in under 8 days.
I would think moderators at this site would have a little more know-how than what I've seen thus far.