This makes trying to continue VFR much more risky
Quite why anyone would attempt to fly VFR in snow is beyond me! That, and the ground risks you cite, are not at issue here.
A high probability of icing in the cloud that is producing the snow/sleet, greatly reducing your IFR options. Once you are in it your airframe will be below zero amongst a mixture of supercooled droplets and snow.
No, that's the whole point. A
lower probability of icing in the cloud that is producing the snow/sleet, because the presence of snow is an indicator of glaciation and the probable absence of supercooled water. If you have a choice between a cloud in which it's snowing, and a cloud at the same temperature in which it's yet not snowing, pick the one that's snowing! And while your airframe
may be below zero, it may not be even in dry snow, and it unlikely to be below zero in snow that has already started to melt to make RASN.