Hi Glen, thank you for your concerns and they're definitely worth noting for others reading this thread. I regularly observe the Sun so yes I do have Baader solar film
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I don't have a finderscope on it to do the cardboard cut out. Just an RDF.
But I really do like your sundial method so I will definitely give it a go when using my 10" dob.
But I tend to use my 4" for this job a lot more as it's easier to take it outside for the short time I spend observing the Sun and it already has the filter permanently attached to it (re designed the cap to accommodate one). When I do night observing, I just simply take the cap off, as one does
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I guess if I can't find a quick method for my 4", I will only be observing through the 10". Just so much more mucking around getting it set up and taking it out for a quick session.