UK Limited Company SEIS trading business complex question?

Anyone know or (have experience) if you can set up a limited company in the UK and claim SEIS tax relief and trade for Proprietary trading firms like FTMO, 5ers etc? I am aware your limited company must be a qualifying trade and one of the restrictions of the SEIS relief is your not allowed to invest in shares/stocks/commodities as a trade of the business. But the way these prop firms are set up is that your not technically owning or trading the currency directly are you??? You are providing your trading entries and exits as an independent contractor as such and then they are internalising the trade themselves. Then at the end of the month you invoice them as a business and then they pay your profits out to your limited company minus their profit share.