What you have in mind may work, not familiar with that particular piece of equipment. Try it and see, you won't hurt anything by trying it out. If it's not good enough, you'll suck air around the top of the dipstick tube and have a slow or non-existent evacuation process. The advantage to using the dipstick tube is speed, much faster than a thin probe tube. In the shop, it matters, we try to save time without really cutting any corners. For home use, it may not matter that much to do it faster.