Band logo based on existing art (attached)

Band logo for 'Zerzura', based on attached photo. Although a doom rock/metal band, there is a strong eastern and mystical influence in the music, hence the choice of the 'Om' for the log. What I would like, and I don't know how practical it is, is to have either an ornate eastern 'Z' in the centre replacing the 'Om', or to have 'Zerzura' written across the centre. I'm not sure which would be better and would value some input on this. Also, the design does not have to be exactly like the one I've attached, that is a guide and I'm happy for something original and quite unlike which still maintains the eastern influence.

If my budget is unrealistic then please let me know what I can expect for that price and also what I can expect to pay to get my vision realised.

Thanks!