How to make a blackletter caligraphy "parallel pen" style brush that can be used as a stroke for curves? (Designer or Photo)

[qendl]

I've been trying to achieve something that seems like it should be simple but I can't make it work. I want a brush that works like a calligraphy parallel pen - the brush tip is basically a 45 degree angled line that's always oriented the same direction regardless of which direction the path of the stroke goes. It would be even cooler if I could adjust the rotation of the brush as a dynamics-curve but I can't even get the basic idea to work so I haven't thought about that yet. I've been trying to get it to work in either Designer (preferably) or Photo but I can't get it in either. I can make something approximately right with a "square" brush in Photo but it can only be used as a raster brush and can't be applied as a stroke to a curve. I'm on pretty old versions of both programs so there may be new features I'm not aware of.

Here's an example of someone doing exactly what I want in Illustrator (starts drawing at 2:18). Notice that no matter which direction his stroke is in the brush stamps the shape in the same orientation so drawing straight down yields a thick line with a tilted end, while drawing SW to NE yields a narrow line:

I've tried using a 45 degree tilted thin rectangle as a "textured image brush" and a "textured intensity brush" in Designer but both brushes stretch, distort, or rotate the image in weird ways. I just want a brush that stamps the same shape in the same rotation continuously to form a line regardless of stroke direction. Surely it must be possible. Thanks for your help everyone.

[NotMyFault]

This works as pixel persona image brush. Doesn't work as vector brush.

[Old Bruce]

Currently there is no way to do this with the Brushes for Vectors. The only way to do this is to use Pixel art and make a brush in the pixel persona.Start with a basic round brush and use the brushes More Pane to change the shape to an extremely narrow oval. Now use the Rotation to set the thin angle.

[qendl]

Is there no way to use it as a stroke along a pen tool curve then?

[Old Bruce]

14 minutes ago, qendl said:

Is there no way to use it as a stroke along a pen tool curve then?

No, "a stroke along a pen tool curve" is a vector. What I and NotMyFault are talking about is a brush for Pixel work. 

[qendl]

Thanks for the replies. Surprised you can't do this.

[Old Bruce]

10 minutes ago, qendl said:

Surprised you can't do this.

You are not alone.