Scale shape while maintaining the stroke weight

Hi there, Illustrator beginning here. I have a basic basic question that should be pretty easy to do but I cannot seem to find a way to do it. I searched through the previous questions but didn't find anything that matches.

I am trying to scale a shape drawing with pattern brush without scaling the stroke width itself.

Here is the setup i have:

1. Define a pattern

2. Create a stroke brush using the pattern

3. Draw a shape using the brush

This will draw a line with the patter size that was defined by step 1. However, let's say I want to draw a new line but with the pattern but just bigger. I would like to be able to change the size of the pattern dynamically (e.g., without having to define a brush for each size). I cannot seem to find a way to do this.

If I change the weight of the stroke, it does change the size of the pattern but it also changes the stroke weight. I tried both with "Scale strokes and effects" turned on and off but they all produced the same result. I played around with bunch of options in the appearance panel as well but couldn't get this work.

Could this be duone and if so, could you explain to achieve it?

Thanks!

This works perfectly. However, let's say I want to draw using the same pattern but bigger.