Catalyst is probably overkill for a single HTML form, but either Mojolicious or Dancer are good, well-maintained frameworks that make creating basic web applications very easy.

I would say that using one of these would be quicker than trying to code directly on top of PSGI/Plack, as they are both well documented - rolling your own would result in a smaller codebase, but would probably take a lot longer to get up and running.