It doesn't sound very tasty to me, but if you do decide to go ahead and try it, make sure they are cooked and not raw. There are phytic acids and tannins in raw lentils that will block absorption of other important nutrients. Cooking destroys these anti-nutrients.

I add adzuki beans to my morning smoothie every day.

I use banana, watermelon (or other melon) bok choy, baby spinach, a mixture of seeds, adzuki beans, and some frozen fruit. DH and I split it. I just finished today's. It does vary sometimes depending on the fruit and veggies we have on hand. I use about 1 cup of beans so we both basically get 1/2 a cup.

If you can dream it, you can do it! But it's hard to give you any ideas without knowing what it is you're limited to. If I were you I would blend them up with some coconut milk, soy milk, and sweetener.