Anyway, is it possible to request Sportsbet to accept BTC payment for the Jackpot? Or let you convert it to usdt or something. Currently I have problems with USDT which is needed to pay for the Jackpots

I actually missed out on it because I thought it was a bit high fee but now Trofo got me tempted.
I did not try it with this promo but it was possible in the past. You could have paid with any of the cryptocurrencies Sportsbet accepts. They just auto-deduct from the wallet you have on at the time of joining.
Just try it and see if it works.