Hey GDog,
My uncle has this spreadsheet he does for the NCAA brackets. He uses it with the mens' clubs he belongs to. He does a bit over 2,000 entries every year. I've done data entry on it a few years back ... it's really easy to do.
I don't know if he'll share ... it's one of those "for me" spreadsheets. I can ask him if you're interested.
As for distribution of the brackets ... set one up using a word processor and convert to a pdf file ... then setup selections as fields on the pdf.
Setup a google-drive (or one of the other browser drives) and post the share location where players can download the pick sheet, make selections and upload the pick sheet.
Sorry ... I won't be participating ... totally love NBA, but can't stand NCAA basketball.