1. It would be much easier than clinical. One of my programs only had 15 applicants to it ( atleast that is what they told me).
2. Yes they are all funded, none of the programs i have been accepted to did not have funding available, although sometimes these programs are the school of education so the funding may be a bit lower.
3. Yes. It is not common to have alot of experience with these topics as they don't present themselves often. I would say, if you are familiar with SEM, Item response theory, factor analysis, differential item functioning, mixed models, etc. IF you are interested in testing I would make sure you are familiar with some of those topics as well such as scale linking, and some IRT software such as IRTpro. You will be a very very competitive applicant. Many applicants just have a stats background and know R and not much past that.
I have a background in the topics i listed and have basically been accepted to every program I applied to (2 years working exp with a masters in same field).