Yes, have been looking at the method on rhodiums site but wanting to find alternate routes was the name of this game.
Just to give us options, and have a bit of fun.
What about this one, to solve acidification problems, basify MeOH with some KOH, slowly drop in conc permangenate solution, MnO
2 is formed, a white precipitate, potassium formate is very soluble in water so it will remain in solution. However!, MnO
2 is insoluble in water, filter the shit out!
wash filter paper with some water and then gas the liquid with HCl gasser were so used to....
Distill out the formic acid, bp 100.8 so water will come over too, but you should get a nice solution of formic acid.