I had to make some Actions to do it.

Beforw start recording, fill the path with a pattern. This is important to enable the Transform objects in the Scale panel.

Create I new action.

Select the Stroked object, press S , Enter and change the scale by 90%. Uncheck Transform objects.

This will create an action decreasing the stroke wight. Unfortunately the path cannot contains a fill pattern or it will increase its size too.

Make another action with 110% do encrease it.

See the image below: Plus a gif showing the action in action.

I had to make some Actions to do it.

Before starting recording, fill the path with a pattern(this is necessary just to record the action). This is important to enable the Transform objects in the Scale panel.

Create I new action.

Select the Stroked object, press S , Enter and change the scale by 90%. Uncheck Transform objects.

This will create an action decreasing the stroke weight. Unfortunately, the path cannot contain a fill pattern or it will increase its size too.

Make another action with 110% do increase it.

See the image below: Plus a gif showing the action in action.

I had to make some Actions to do it.

Create I new action.

Select the Stroked object, press S , Enter and change the scale by 90%. Uncheck Transform objects.

This will create an action decreasing the stroke wight.

Make another action with 110% do encrease it.

See the image below:

I had to make some Actions to do it.

Beforw start recording, fill the path with a pattern. This is important to enable the Transform objects in the Scale panel.

Create I new action.

Select the Stroked object, press S , Enter and change the scale by 90%. Uncheck Transform objects.

This will create an action decreasing the stroke wight. Unfortunately the path cannot contains a fill pattern or it will increase its size too.

Make another action with 110% do encrease it.

See the image below: Plus a gif showing the action in action.