Any advice on this variant or should I submit it once I get enough testing games?
I tried doing this before (https://www.chess.com/variants/custom/game/63878975/22/1), but I think that's fine. One thing I would change is make it so pawns promote to royal king, but that's just a 2bHNST style thing.
There's already a royal king on the board
I meant no king on the board. It might not be a practical change.
Then why would you promote? I'm not going to overcomplicate this and add a hill.
 
     'h4','','h11',''),'pawnBaseRank':5,'wb':true,'dim':'8x8'}-x,x,x,x,x,x,x,x,x,x,x,x,x,x/x,x,x,x,x,x,x,x,x,x,x,x,x,x/x,x,x,x,x,x,x,x,x,x,x,x,x,x/x,x,x,yS,yM,yI,yF,yW,yI,yM,yS,x,x,x/x,x,x,yβ,yα,yγ,yδ,yδ,yγ,yα,yβ,x,x,x/x,x,x,8,x,x,x/x,x,x,8,x,x,x/x,x,x,8,x,x,x/x,x,x,8,x,x,x/x,x,x,rβ,rα,rγ,rδ,rδ,rγ,rα,rβ,x,x,x/x,x,x,rS,rM,rI,rF,rW,rI,rM,rS,x,x,x/x,x,x,x,x,x,x,x,x,x,x,x,x,x/x,x,x,x,x,x,x,x,x,x,x,x,x,x/x,x,x,x,x,x,x,x,x,x,x,x,x,x"]
'h4','','h11',''),'pawnBaseRank':5,'wb':true,'dim':'8x8'}-x,x,x,x,x,x,x,x,x,x,x,x,x,x/x,x,x,x,x,x,x,x,x,x,x,x,x,x/x,x,x,x,x,x,x,x,x,x,x,x,x,x/x,x,x,yS,yM,yI,yF,yW,yI,yM,yS,x,x,x/x,x,x,yβ,yα,yγ,yδ,yδ,yγ,yα,yβ,x,x,x/x,x,x,8,x,x,x/x,x,x,8,x,x,x/x,x,x,8,x,x,x/x,x,x,8,x,x,x/x,x,x,rβ,rα,rγ,rδ,rδ,rγ,rα,rβ,x,x,x/x,x,x,rS,rM,rI,rF,rW,rI,rM,rS,x,x,x/x,x,x,x,x,x,x,x,x,x,x,x,x,x/x,x,x,x,x,x,x,x,x,x,x,x,x,x/x,x,x,x,x,x,x,x,x,x,x,x,x,x"] 
    
 
      
Any advice on this variant or should I submit it once I get enough testing games?
I tried doing this before (https://www.chess.com/variants/custom/game/63878975/22/1), but I think that's fine. One thing I would change is make it so pawns promote to royal king, but that's just a 2bHNST style thing.
There's already a royal king on the board
I meant no king on the board. It might not be a practical change.