Set up the event once, load the template in Photo Mechanic, caption each frame with roster codes, then push to Lightroom and publish.
Need ideas? Generate keywords from the event name
Paste the roster from 12thman.com, one player per line. Each player gets a code you type in Photo Mechanic.
In Photo Mechanic: Edit > Preferences > Code Replacements, check Enable and load this file. Then type \vb1\ in a caption to insert the player.
Load someone's Photo Mechanic template, or a JPEG they've already captioned, to fill in their name, job title, contact info and rights. Each one is saved here so you can switch between people.
In Photo Mechanic, type before the back half.
Unzip, then in Photo Mechanic: select all, Image > IPTC Stationery Pad > Load, pick the .XMP, Apply.