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A 3x barlow would be the way to go to get a 3000mm effective focal length with your scope. With a barlow you can do prime focus like you are doing now.
Yes it the f30 works "in theory", but if that theory is sound it would tell you that you would need to go to a lot of effort to make a 3m telescope stable and sturdy (just the scope) and more effort still to mount it properly. And in the end, a 4" refractor with a barlow will perform at least as well (probably better).
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