I say GO for it. Getting an interview is already a big step forward and its a chance you wont get everyday. Even if you have to spend thousands I think its worth it. try your luck. even if it doesnt succeed you wont always have that thing on your mind:'Would they have selected me?....would I have become a pilot?...' and thats gonna stay your whole life, I say go for it. If I understand what I have read here, someone who is 1M60 will be able to use the full travel of the rudder whereas a guy who's 2cm shorter wont. That cant be serious. If you never try you never get, so i say go for it. Money is nothing compared to a life changing opportunity and a dream come true! Best of luck with that!
