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Most barlows one step up from the el super cheapos [ say, $75 or more]are quite good for AP, barlows being simple lenses. If you have the odds and ends
needed, you could try a 1.25"one, which you might already have. If reasonably happy with the results, you could step up to a 2" if you wanted to.
You could try eyepiece projection, and then you would only need an
eyepiece projection adaptor, and you could use EPs between 20 and 40mm,
so you would have control of your focal ratio.
Here are a couple of EP projection single frames I took many years ago with an 8" Newt;
forgotten which eyepiece.
raymo
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