Hello @mosschild and welcome to the community 
There is this bundle here:
If I remember well, some of the halftone brushes in there work with pressure, so not when making the brush bigger as you explained, but it might be worth a try?
Hello @mosschild and welcome to the community
There is this bundle here:
If I remember well, some of the halftone brushes in there work with pressure, so not when making the brush bigger as you explained, but it might be worth a try?