3/ Finally spend the 3% with very high fees to prioritize the tx confirmation ! ? ??
What will you achieve by making that extra transaction?
In that way, you would have to pay fee for two transactions and you would waste more money on fee.
First transaction fees could be set as low as 1Sat/Byte ... the
UXTO on the scond would be from the unconfirmed first Tx, so spending it with high fee is to accelerate and promote its confirmation and its confirmation will entangle with it the confirmation of the first tx.. as the first is a parent transaction!
My bad that could work as well with client wallet that change adresses.. but needs wallet with customisable blockchain explorers to set an explorer that recognize the low fees transaction. !