Why do you want a new paint job? If every part of your bike makes you happy, then can you just deal with it? The paint is just window dressing. It doesn't make any difference in your riding. I know some people get all excited about paint/custom jobs, but, in the end, it's not going to make riding any better for you.
I don't know anything about the Amira, so I can't answer your questions about the weight, etc. You already said weight doesn't matter. As far as cranks, my LBS tried to sell me that load of sh!t about longer cranks making me into a "powerful animal" on climbs when I bought my Kuota. Yeah, sure. I could barely turn the pedals with th 170 mm cranks and I *never* stand when I climb. My hips felt out of whack, too. Both of my previous bikes had 165 cranks and I had to push the case for them to order me 165s for my frame. Someone 5' 1" doesn't need bigger cranks.
If you have to have the paint job, then get it. I would not get a new frame.