Opening it up in Illustrator or a free vector graphics program, you should be able to trace it and clean it up in 3 hours. It isn't that complex.
You could also print it out extremely large on photo paper, then trace the outlines with a fine-point pen, color inside with a fine-point brush and black paint, and you're done. Scan it back into the computer at high rez, then save copies at smaller rez.
Break out of the use of the computer once in a while.