@123abc It would be challenging for you to switch to move to futures and keep the cost low on all instruments you mentioned because then a broker (FCM) would need to be a member of each exchange, and in reality most would use some corresponding banks where cost could be higher for execution.
Our division (
Optimus FX) that deals with foreign customers (outside USA traders) could potentially arrange to work with a liquidity provider directly in the event that your volume justifies it. I am not sure they can provide zero spreads, but they could provide deep liquidity with thin spreads that may be accompanied by small commissions. Again, unless the volume is examined, this is the general info I can provide.
Also, consider dividing your business between CFDs and Futures if necessary because you may get deep liquidity on some instruments while we can arrange reasonable day trading margins. For example, Dow Jones, DAX, FTSE could all be traded over TT Trading Technologies in the USA or Europe. I am attaching here a playlist for the TT:
TT Videos
We work with TT. Patrick my colleague here is one of the hardest working people in the industry, so you get a good team on your side that always works on product improvements.
I hope this helps.