For the P.S. you could probably get by with cheap PC power supplies converted for on-off use (get the right connector and you can handle the conversion as a snap on so replacement would be a swap of a shelf unit not modifying one each time). They can be had rather cheaply in quantity, and a basic off brand would most likely be reliable enough for the purpose. Is 30V 2A the required for the speed and torque you need? Or could you drop down to a 16 or 24v doorbell transformer - hundreds of sources for those and should be much cheaper than the xfmr you list above.
Sorry I can't give any help on the driver, I'd probably get some help designing my own (since you don't sound like it needs a lot of features and you're environment won't be too taxing it wouldn't need a lot of the protection circuitry) and source everything back through you.
Just spitballing. HTH
Greg
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