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As mentioned DSO type Ha filters are unsafe to use for solar observing ( unless they are used a secondary filter behind a safe solar filter )
To effectively view detail in Ha the bandwidth needs to be around 0.1nm!!
hence the high price of specialised solar filters.
Spectroheliographs (SHG) are certainly a way forward (basically using a spectroscope with the telescope to acquire a video of the solar spectrum as the telescope scans the surface of the sun.)
Post processing of the video allows for the extraction of an image at any selected wavelength. The SHG and associated software is gaining maturity and I'd say within the next ten years will be a very workable solution.
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