I will say, my cholesterol is still good with my 'oatmeal for breakfast' routine that I started a few years ago. Lucky for me I don't get tired of things very easily. I've been with the same man for 33 years, in the same house for 29 years and at the same job for 35 years. lol! I can handle it.
Our nurse practitioner at our dr office said dietary fiber works like little tiny sponges that suck up cholesterol from your body.
Metamucil has lots of fiber too and
Amazon has a cereal (yes, I know it's processed) that's called Poop Like a Champion. It has
23 grams of fiber in a 1/3 cup serving.

If you're not familiar with usual amounts of fiber, that is a huge amount. Way more than oatmeal and Metamucil combined. Don't eat a whole bowl of it though. Stick to the serving size until you know how your body responds. The chocolate flavor is nasty and I tossed the rest of the box. Cinnamon was ok but I can't find that lately so I'm stuck with plain.
So, really, it's not just oatmeal for breakfast. I'm all about fiber now.
Hershey's chocolate with almonds, for the benefit of eating the almond, is defeating the purpose. Buy a bag of almonds and a nutcracker. They also sell them already shelled. Pistachios have a lot of fiber too.
Also even if your wife eventually lets you eat seafood, shrimp is high in cholesterol so avoid that.
Good luck.