Well, when I said simple, I was hoping for something that'd add one or two steps, not something that'd upgrade to an entire culinary experience.

Of course, if I added meat and eggs and manually boiled rice and did it on the stove with pots and pans it'd be better. Valka's is the closest since I already prepare the peas and corn in the microwave in a container, and I'm adding the peas and corn as a side dish to up vegetable intake.
Rice is hit or miss but I can try. I haven't tried it since before the food poisoning; maybe it's okay to eat again.
What sweet and sour sauce do you use,
@Valka D'Ur? Do you microwave it again after adding the sauce?
I use
VH sauce. There are several varieties, including plum sauce, sweet and sour sauce, cherry, honey & garlic... more I never heard of. The ones I use are either plum or sweet & sour, and they do me well for rice, chicken, and fish.
I don't tend to microwave again after adding the sauce unless the sauce has just come from the fridge and is cold. In that case, half a minute should be more than ample, since you don't want to overcook the rice.
I don't know what kind of microwave you have, so my recommendation is to experiment and see what works best for you. But what I normally do is to microwave the rice, stir the vegetables into it, mix it up, add sauce, and eat. This will make a generous plateful of vegetable-microwaved rice with sauce.
If you're worried about how much sugar is in all this, my suggestion would be to eat half and save the other half for another meal. Sugar isn't a problem in the rice, but there are (according to the label on my 341 mL jar of VH sweet & sour sauce) 11 grams of sugar per 2 tbsp (30 mL) of sauce. Don't ask me how much sauce I use because I just open the jar and pour some over the rice and stir. I doubt I use the same amount twice in a row.
If you're watching your sodium, you should probably not eat a whole packet of Uncle Ben's rice in one meal, because it's pretty high... 740 mg or 31% of your RDA. The sodium in the sauce is much lower, only 2%.
This is, of course, assuming you use the Oriental Style variety. I just checked another one I have and the sodium level is much less, but I'm not sure if it's good with plum/sweet & sour sauce.
Could do something similar to what I do to gussy up canned green beans: butter, salt, pepper, and some Italian seasoning. Don't skimp on the seasonings (but uh, don't way overdo it either). Pretty tasty. Last night I also added a few handfuls of fresh spinach. You can also add butter beans, carrots, etc. Although I usually microwave sliced carrots separately with some butter, a splash of water, a little brown sugar, and some salt.
Green beans are not food.
You don't have to use sugar. My mother would put sugar on lettuce to bribe me to eat it, and I confess that's a taste I never lost - just sprinkle sugar on the lettuce leaf, roll it up, and eat it like it's a piece of candy that happens to be a plant. But any properly prepared peas, corn, or carrots do not require sugar.
In the SCA we tended to substitute cinnamon for sugar if using a modern recipe, since refined sugar was not common in most of the times and places represented in our Shire. We had to be careful not to overdo it, though, because one of our members had a really weird immune system. He's deathly allergic to garlic, and cinnamon makes him higher than the proverbial kite. So it was a tossup between risking killing him if he smelled garlic or getting him the equivalent of drunk if he ate or got a whiff of some dish with cinnamon in it. Any feast I autocratted was garlic-free and cinnamon-lite (we'd also use honey in place of refined sugar, as it was period-appropriate). Of course, being a New World Shire, we felt free to use chocolate at times (hence my experimenting with chocolate-coated grapes), and once put on an Aztec feast that featured turkey with chocolate sauce.