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For others in this position, here's my simple script:

#!/usr/bin/env python

import sys
from catkin.find_in_workspaces import find_in_workspaces

try:
    script_name, package_name, file_name = sys.argv
except ValueError:
    sys.stderr.write("Usage: find_file PACKAGE FILE\n\n")
    exit(1)

path = find_in_workspaces(project=package_name, path=file_name)

if len(path) > 0:
    sys.stdout.write("%s\n" % path[0])
else:
    sys.stderr.write("No file found in package.\n")
    exit(1)

Usage is:

rosrun mypkg find_file mypkg myfile