@Bast. Of course you can look after thin new cat. Odin needs love. You can give that. Odin needs protection. You can give that. Odin needs warmth, a bed, food, routine, security. You can give all that.
Taking on another animal that desperately needs a home - that is not replacing Bast - that is not what is happening. You had space in your heart and life for Bast. You will make space in your heart for Odin. It won't take away the pain and grief of loosing Bast. But Odin will fill another part of your life. And I think it's beautiful that you are willing to give a cat a much needed home.
Ignore that voice that says you can't manage. It's wrong.
You CAN do it.