Maintaining Stroke Weight when changing path to brush stroke

Is there a way or an option I am missing to convert my regular paths to a path stroked with a brush profile,while maintining the proper stroke width?

For instance, I have a regular line with a stroke of 5 and then add a brush profile, which then converts the original stroke to whatever the brush was made at.

Can I change this? I am hoping I am missing something with an option or how I make brushes Image may be NSFW.
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Thanks!