Toggle between brush blending modes (normal and clear)

Yes is same key as for toggling through Layer blend modes. You just need to first make sure you have the paintbrush selected.

Shift + cycles forwards through blend modes

Shift - cycles backwards through blend modes

To go between normal and clear you will need to hit the shortcut 3 times.

Our you can use "b" & "e" to toggle between the brush and eraser tool

To toggle between eraser and brush use "e" & "b".

The shortcuts can be found here for all tools.

Nice lionfish additon in 2018 Adobe!

I have complete same need as rousinhahessy. I wish adobe let us edit shortcut keys and/or the list of blending modes. Hiding modes except Normal and Clear would be great. It would speed up my production drastically.

It turns out that there are direct shortcuts for brush blend modes, including for Clear and Behind

Blend Mode Shortcuts in Photoshop « Julieanne Kost's Blog

Almost all of the blend modes in Photoshop have their own keyboard shortcut. They all begin with Option + Shift + a letter (Mac)/ Alt + Shift + a letter (Win). Most often the letter is the first letter of the name, but not always!

Normal + N

Dissolve + I

Behind  + Q (Brush tool only)

Clear  + R( Brush tool only)

Darken + K

Multiply + M

Color Burn + B

Linear Burn + A

Lighten + G

Screen + S

Color Dodge + D

Linear Dodge + W

Overlay + O

Soft Light + F

Hard Light + H

Vivid Light + V

Linear Light + J

Pin Light + Z

Hard Mix + L

Difference + E

Exclusion + X

Hue + U

Saturation + T

Color + C

Luminosity + Y

I couldn’t find a shortcut for Subtract or Divide, but if you know of one, please add it in the comments!  If you want to quickly cycle through the painting tool’s blend modes, hold the Shift key and hit the “+” (plus) or “-” (minus) to move forward or backwards. Careful: f you have a tool selected that is not a painting tool, these shortcuts will affect the blend modes on the Layers panel.

I don't use them myself, but I do use the G-Keys on my G910 with either key sequences or macros to trigger Photoshop multi key shortcuts and Actions.

Regular poster JJMack has one of those very nifty Logitech G13 keypads which he has made full use of by assigning all three banks of all 27 G-keys

Re: Short Cuts - Step Forward & Step Backward

With credit to JJ, this is his GIF, and I am in awe of it.  You can assign any of those keys to trigger shortcuts regardless of how many keys it uses.  I have actually used my G910 G-keys to insert long and frequently used URLs into forum threads (but not at the moment because I am in between systems)

I am not sure of the G13 status nowadays.  They can appear to be hard to find.  Amazon shows them in the USA, and I have just asked if they ship to NZ, because I'd love to have one.