If you are having a hysteroscopy anyway then it is a no brainer to get a mirena IUS put in at the same time.
The fact you are having the procedure suggests either a history of problem bleeding and/or endometrial thickening, both of which are best treated by the IUS.
Micronised progesterone is the least potent option for endometrial control.
Stopping altogether means you don't get the long term health benefits, so I would not let yourself get talked into this for short term convenience.