By far the easiest solution is a 2x Barlow T-adapter. It reaches focus easily and adds a fair bit of magnification. Worked a treat on my 8" Dob reflector. Celestron make them; think I got mine from Australian Geographic.
Having said that, the only things you'll be able to shoot without a tracking mount are planets (which is why the magnification of that Barlow is essential - planets are reeeeally small). Darker objects are impossible without long exposures - take it from someone who tried!! I sold my Dob and spent way more than my wife thought was reasonable on a mount and small refractor...
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