At 230m-250 you'd be heading into camera lens territory. Not sure if I would buy one of those (although they're out there not expensive, like the Askar guide APO/astrograph ) instead just add a focal reducer to a 350-450 mm telescope.
A focal reducer wouldn't reduce the weight of a scope,which is part of the considerations for a portable setup and an appropriate low capacity grab-and-go mount. In fact, it adds to the weight of the setup.
And who says heading into camera focal length territory is forbidden? Some of the advantages that scopes have over camera lenses is not that it has longer focal lengths but that it has a smoother focusing mechanism and very sharp optics for the price. Scopes also don't limit you to using sampling challenged DSLRs and color cameras , except with cumbersome adapters and modifications which add to the complexity and the danger of something going wrong in the train.
Not because of the "fear" of heading into camera lens territory which in fact, doesn't mean a thing.
After all, there are camera lenses that have more than 600mm focal length. Canon has an 800mm focal length camera. So, even your scope is in camera lens territory.