I've worked as an SE as well, and I'm definitely not looking to add to the team's workload. Right now they're filling out a weekly spreadsheet and sending it to me, which sucks for them and for me. I'm looking for some way to make it easier for them to enter their time and for me to look at the data across multiple weeks, either by account or by SE.
Any software replacement for spreadsheet for SE will be swapping time spent on filling spreadsheet to filling online form unless software pulls information automatically from what SE already doing in other repositories.
If spreadsheet has standard format, it may be of help to have a file upload tool that imports the data from uploaded spreadsheet to a database. And, if you have database expertise, you can manipulate the data in database whichever way you prefer for reporting purposes or have a few standard reports developed for you.
It's possible to use the spreadsheet as basis for upload, but if I'm going to do that, I'll build my own front end too. I'm hoping to find something that will work rather than roll my own.