The Dunlop is a good pedal but not really designed for pedal steel, as you probably know. A dedicated pedal steel pedal has side entry jack sockets which work better for fitting the pedal into your rig. There are a variety of dedicated pedal steel volume pedals out there, essentially either passive or active. They tend to be on the expensive side compared to other types of volume pedal but are worth getting imho.
I'm currently using a Lehle Mono 90 active pedal which I like, you can also buy a fixing bracket for it,

- Lehle Bracket.jpg (11.1 KiB) Viewed 1698 times
The pedal is around £229 and the bracket is £59
Here are a couple of pics of mine in situ. The bracket has a swivel on it, so you can position it at an angle which suits.
Of course there are many ranging in price up to the Telonics multi-taper pedal which I believe is in the £700 range? and is available from Mark Dunn on this forum.
My friend Calum and I did a bit of a comparison between 4 pedals a while back, you can view the post here,
viewtopic.php?f=39&t=15471Then there are low profile and high profile versions, depending on your leg room, a lower profile pedal might work better than a high profile pedal.
I know, too much choice, but I hope that this helps to show some of what is available. Personally I like the Lehle, it works by using a magnetic field sensor, so there is no noise coming from using a pot pedal where the audio signal goes through the pot itself, and the pot eventually degrades over time and requires replacement.