Your 3 in 1 uses imidicloprid for the insect killing chemical. It is pretty safe to use, and most of us use it on our dogs and cats, if you use Advantage. Even though you drench with it, it can also be used as a direct contact spray. As a direct contact only, it only lasts a month, but it does kill at once. Systemically, as a drench, it lasts months. The bad side is that is is a neonicotinoid, which is killing our bees. I would not use it for that reason. You know what I would use. The tea made from used coffee grounds kills all the insects you are having a problem with, and not only is it safe, but you would be fertilizing your plants at the same time.
If you need a systemic specifically, putting down the used grounds as a mulch around the root systems will systemically kill insects for 4 to 4 1\2 months. You could spot spray now to kill everything on the plants, and then mulch before you go away.
Tom