It's not so much the weight of the dish, its more about the potential wind-loading when a storm whips through your neighbourhood.I don´t know if could be possible to do something like that for so heavy dish like CM180 is... it is only idea...
A 180 dish is like a small boat sail - it will reqiure heavy-duty metal to keep firmly and safely attached to your monuting pole. Not to mention keeping it aligned properly!
This is what the original CM polar monut looked like (image from an earlier Ebay ad).
Some would argue that even that is a bit flimsy. But it seems to have supported many a CM180 throughout the past 30 years, so maybe its an ok design.
Forum member @CROSSBONES even had a copy made which lokked very much like the original. He sold it, but it pops up from time to time on ebay...