I do not recommend using a VPN or doing any tricks that might enable you to use a particular site for any possible period of time. This is not recommended for websites that require proof of identity and residence. Then do not forget that you intend to place bets of huge amounts, so it is necessary to deal transparently with any platform you will use.

On the other hand, I do not understand why you insist on betting the entirety of that huge amount at once instead of dividing it into smaller amounts and then you have chances on the rest of the platforms available in the market.