Yes, yes you can!

I like the second idea. That sounds more like a real language to me. I mean: ichi, ni, san, shi, all sound somewhat similar; un, dau, tri, sound somewhat similar (bearing in mind that a Welsh u sounds exactly like its i). (Pedwar doesn't sound like anything else at all. Oh, Welsh.)

For Talani, I have: ma, me, mi, mo, mu, la, le, li, lo, sa. Possibly not very natural ;)