The trial is there to get your hands dirty. You can do A LOT in two weeks. Though if it's about finding the right CMS, I don't think the trial needs to be a part of that (you could find one in that time frame). I say that because the trial will let you see how things work in Webstudio. If you like the way things work including CMS integrations, the you'll need Pro regardless of the CMS you end up using.
Heres a tool btw to help find a cms
https://wstd.us/cms-finder