I am reliably informed that the inability for FIKI certification of the Columbia and Cirrus rests with their (ugly) fixed gear.
If that is the case, why not just de-ice the struts and spats? Can't be too hard to put some TKS fluid there if that is the issue... or fit some fancy thermal-electric tape if that is your preference. Also, unlike antennae, the main gear struts are designed to take the forces of the entire airplane being slowed down by the wheel brakes.
Also can't see why, say, two metres of strut and 50-100 square inches of non-deiced front cross-section for the spats and wheels should be so much worse than the several metres of wing / fin leading edges and square METRES of fuselages, nacelles etc. that are not de-iced even on de-iced twins.
Look at a Seneca, for example - only slightly more than half of the fin leading edge has a boot, the wing inboard from the engine nacelles is not de-iced either, nor are the engine nacelles who have a cross section much larger than any fixed gear...
The primary reason Icing increases drag is not that the Ice is hugely draggy - yes it is, but it also ruins the L/D coefficient of these carefully designed wings, so you have to increase the AOA to maintain sufficient lift. In other words, drag increases, but lift decreases as well and even more so - hence the much higher stall speed of an iced-up wing compared to a clean one.
A good illustration of this is what happens with your tailplane - you will not fall out of the sky because of the drag the ice on it creates, but because you cannot create the aerodynamic forces (=lift) required to control your pitch. The available downforce reduces, while the need for downforce increases because you have to pitch up to maintain the lift of the main wings. This ends with you either running out of elevator authority or the tailplane stalling - both with very dire consequences.
The additional drag is not a major factor, compared to that...