Look at it this way. You need to just tune a harp and you only have 45 minutes and you don't have a tuner.
Tuning the harmonica sans a tuner in 45 minutes is the easy part. Acquiring the context to do so is the difficult part. Anyone asking for a quick set of numbers by which to tune by really shouldn't be trying to tune their harmonicas to any form of JI. Of course we all have to start somewhere it's just that a set of numbers isn't a begining, asking the question might be though. fjm