Spawnbags are wonderful and frankly are the only way to produce spawn in any amount.
Were I you however, I would not work directly with spore syringes if I was dealing with bags. Liquid culture in any form (either germinated spores or dispersed tissue) is far better for this sort of work. You can put as little as one cc of any sort of carrier into your bag but 5 to 10 ccs is superior - you don't want to use up all of your spore water on this when you can innoculate all of your bags with 100 ccs of lc.
If you are careful, you can shake the bag quite thoroughly and so your time to colonization is always about the same, it is the same as colonization of quart jars as well. I don't think I have ever encountered a bag in 82 degree temps colonize in more than 10 days. I am uncertain where you are getting your bags, are they pre-filled? They MUST have an injection port of some sort, you can make one yourself pretty easily if you are filling your bags yourself. That is the cheapest way, bags cost 50 cents each and an impulse sealer is about 60 dollars.