Hi, I've never backed a Kickstarter project and I'm strongly considering backing Siege of the Citadel. My only caveat being the high shipping cost to my country. So I wanted to ask whether I can pledge 1$ now and in the future, after the campaign ends, change my pledge to the Dark Legion one? If so, what's the deadline for doing this?
I don't know whether Keiwa has any affiliation to the project team and therefore has a definitive answer, but there's no guarantee that the Pledge Manager will allow a purchase at the Dark Legion level. I'm absolutely sure that it'll allow Doom Trooper and as many add-ons as you like, but unless it's confirmed somewhere, I wouldn't assume that you will be able to convert to Dark Legion. Simplest way to get this information is not via BGG, but by messaging the project creator on KS. Use the "Contact" link at the top of the project page.
You can make changes in your Kickstarter pledge after it ends in the Pledge Manager. Whatever pledge level you choose can be changed to any other pledge level and add ons can be purchased at that time.