I wear the orthodics in all my footwear. Bar my slippers i have on at the minute
I suffer from blisters on arch of foot too. always on the left one more for some reason. But when i run without the orthodics in my runners or boots, i get sore all over, ankles, calves, achilles. so im dammed if i do.. I take the blister option as its lesser of two evils. Compeed blister plasters are my saviour.
Physio recently told me nobody should be wearing orthotics long term as the muscles in your feet etc begin to depend on them and hamstring, calf etc injuries follow. Your body is all linked and if one part isnt doing its part another part is overloaded. Recently reading about barefoot training and the benefits of this for stability and mobility.
Point 2 is a bit more obscure. If u have a blister that burst but skin still attached and have very tender skin underneath then get some superglue and stick the skin flap back to your foot. Did it recently with a v sore blister and worked a treat.