I'd just use a series high value R and any battery. Adjust the R for a full scale reading or close to a full scale reading, measure the V across the R and scale up if you have to, to figure full scale µA. I = V/R. The meter movement is a current-operated device.
If you then measure the V across the meter movement, then the meter movement resistance is V/I, with I from above. Then the movement will be fully characterized.
If you have your ohmmeter specs, you already know what current is excessive for this meter movement.
You could also use the ohmmeter as a battery, and just put the series R in series with your ohmmeter and the meter movement.