If he want to save that 6$,he might lose few hundred dollars in year.
He just wants to get the BTC elsewhere without paying the hefty BTC fees.
Pretty sure OP would convert them back to BTC afterwards.
seem a lot of hard work. he can just send from one exchange to another using this x coin to trade in that exchange for whatever his reason of moving.
but since he already said he wants to keep for long term BTC, i believe he would just pay the BTC withdrawal which could be $6. its nothing compare to what could be the value of BTC if he have to keep it for about 3-5 years in a cold storage. chose you wallet carefully.