Hi Ingrid. Mostly just a welcome message here as I have little to add to the previous advice: Saw/Rasp/Sand.

Further to the Japanese Saw Rasp, definitely will be adding at least one to my tool box. (Are you listening Santa?)
I've had a couple of jobs recently where one of those would have been just the ticket.

I'm seeing them between $48-$59 without shipping, so a very manageable amount for the value it could provide.
I think FrankenWashie uses them a lot.