To the best of my current knowledge, all convertible dual gauge knitting machines have only manual/basic needle manipulation capabilities and are all plastic needlebeds.
Brother KH360, 4.5/9 mm
Brother KH365, 4.5/9 mm
Brother KH370, 4.5/9 mm
Brother KH390, 4.5/9 mm
Brother KH395, 4.5/9 mm
Brother KX395,4.5/9 mm
Brother KH400, 4.5/9 mm