I love the choice of oman since india seems to be in a stalemate and the middle east dominated by persia, another player in the region is a perfect addition to spice things up
Talking about mods... how about checking out the best total covertion mod for Eu4, Anbennar? It released a new update yesterday and im sure you could have some cool as gigachad stories there
I have played it before off-stream, it's lots of fun, but a lot to take in. I'd like to get more experience with it first before doing any content on it.