Some people have found they can use the attachment method before having 5 posts, though I'm not sure it's worked for everyone. Looks like you've got more than 5 posts though now anyway
Hey there! I just joined too and I'm from Singapore although i now live in switzerland! I grow 8 different types of orchids here but no vandas. Lucky you that you can as they are so beautiful! The climate in Europe makes it very hard to grow them. Which kind of orchids do you have?