First off, I don't want to be the spelling police, but if you're planning on installing 'lental' beans in the opening, I don't think it will work, they are too soft and mushy to hold any weight.
However, what you want to use are lintels. And yes, you can do that without cutting them into the concrete. Cut the opening out a little larger, so you can fit some Pressure treated 2x4 or 2x6 jack studs to hold the lintels up. Cut them tight to fit. If it is a small window opening, you can get by with single jacks, if it is larger, you should double them. You will just have to make up for the larger cut-outs by patching in the areas with trim on the outside, sheetrock on the interior. It can be trimmed out, ... if you do it right.
And yes, we have done this very same thing in several projects and it met our state building code requirements.
- 2 cents