OBIEE with Essbase has lot of work arounds and it is not straight forward for complex requirements.
It is better to check your question in OBIEE forum, but to my knowledge you have an provision to show level 0 members which can pull you level 0 data in the final layer.
Also there are functions which can split the member names by character count. Else you can ignore it on final column in your reporting. How about using an Alias option ?