Repeat steps 3-7 Now just repeat steps 3-7. Thus freeing up the slot for another new character.8. Delete character As this new character is only going to be used to farm Strange Coins, you can delete it. Remember, although Glimmer is shared between all characters, coins are not shared so you need to use the Vault.7.
Put the Coin in the Vault Now that your new character has the coin, go and put it into the Vault (near the spawn point of the tower) so your other primary character can take it out. Buy another Strange Coin from Xur Xur will still be at the Tower, so go over to the same place and trade in another 2500 Glimmer for another coin.6. It's a bit tedious but just rush through the mission as fast as possible.5.
The Tower will be locked for your new character so you'll need to get through the early missions to get access again.