My wife and I have a toddler who is ready to graduate to a big boy bed, and her parent's handed us down a twin bed that they've had in storage for years (woo hoo).
The problem with it is that someone drew all over a section of it with pen (probably a Bic pen, or similar):

My wife says this stain has to go, and wants me to sand the entire bed so that, when re-finished, it all looks the same color/etc. Not my ideal weekend: I envision the sanding being a 10 - 12 hours job, minimum.
If it helps with a solution, this wood is maple.
Before I lose an entire weekend to sanding a 20-yr old bed, I have to ask: is there any solution under the sun (besides buying a new bed) to getting rid of this pen stain, that (ideally) doesn't involve any sanding, but at the very least only requires me to sand this one area? Requirements:
- Minimum amount of work for me
- Entire bed frame looks contiguous/the same (no eye sore patch where the stain used to be)
- Safe/eco-friendly/non-toxic solution (my 2 year old son is sleeping on this thing and could be gnawing on the wooden frame for all I know)
Thanks for any ideas/solutions!