Application to run PowerShell scripts
I think the time and effort it will take to set up another tool that performs this type of work will be about the same as it would be to setup Jenkins. If you are looking into a different tool though, I would checkout Rundeck. It is a great tool for creating scripts and allowing other privileged users to execute them. I'm not sure if it will meet your needs for predetermined fields/dropdowns, but there are plugins available that may help.