I messaged them and they replied saying it shouldn't be a problem.
Kickstarter Support (Kickstarter)
Jul 8, 11:51 AM
Hi James,
You should be totally fine! Let us know if you need anything else.
Best,
Alfie
skilljim
Jul 8, 9:58 AM
Hi, I am a big Shenmue fan and have backed for the $1500 tier on this account. I also wanted to get the $80 tier so I would be able to receive both rewards, and I have backed this tier on a second account. I have backed it using the same debit card as I thought this would be okay, but I wanted to just double check before the project finishes that my card will be successfully charged twice, one for each of these 2 accounts. I needed to use 2 accounts, as it's not possible to back more than one unique reward tier, that the Shenmue 3 Kickstarter project happens to have.
Thank you for your time and help
James.