AKradian

https://maplestory.nexon.net/news/75339/new-journey-maple-point-reward-temporarily-disabled

How is this faster than right-click to sell?

Yes, when you delete a burned-on-creation character, you should get the option to tera burn a new one instead.

However, there is currently a known issue:

Known Issues section in Update Notes wrote:

Tera Burning Plus event's Tera Burning character cannot be created if the player used the Tera Character Burninator item first.

So if you used a Tera Burninator (on a different character) you can't create a Tera Burning character at the moment, regardless of whether it's your first one or a replacement for the one you deleted.

You can try making a Customer Support Request (ticket) at http://support-maplestory.nexon.net

Kain is a Nova, so only shares cash storage with other Nova (Kaiser, Angelic Buster, and Cadena).
Mercedes is a Hero, so only shares cash storage with other Heroes (Aran, Phantom, Luminous, Evan, and Shade).