A paper written by D. Ludois, J. Lee, P. Mendoza, G. Venkataramanan suggests that adapting a MOT transformer for other use could benefit from removing the magnetic shunts and the filament winding and adding about 10 turns to the primary. There may be information on the internet that shows how to do that. Look at:
Reuse-of-Post-Consumer-E-Waste-for-Low-Cost-Micropower-Distribution.pdf