Could you also change to fiat currency?
maybe it would be a good way to avoid the bitcoin high fees in the exchanges, I will try the gatehub platform to see how it is going
Yes, if you decide to sell your gold bars, you can do so.
With regard to the bitcoin fees - it really depends on the XAU / crypto rates. As of March 21 9.21 pm (CET + 1) the exchange rate is 0.00472 BTC for 1 XAU on Ripple. If you check BitStamp - 1 BTC is 7,233 EUR at the time of writing so you end up paying 34,11 Eur for 1 XAU.
The spot price for 1 g physical gold is 34,72 Eur. This would result in a profit of 1.78%.