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Hi Solanum. IF you were able to get a 40mm off axis Ha aperture filter for your 10" dob, which in not very likely, you would not see anymore detail than you would with the PST. 40mm aperture is 40mm aperture whether it is a dob or a refractor (which is what the pst basically is).
To view Ha from the sun through a scope the front filter is only part of the system. In most filter situations you will also need a further blocking filter at the eyepiece end of the scope. Both filter structures need to be pretty well match/tuned to each other to do the job properly.
However if you search the internet you will find some references to converting an Orion ED80 to a solar Ha scope using the parts from a PST. I don't see how this would improve things because you will still be using the 40mm filter but there have been some positive reviews about doing this.
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