Yes and yes. It is feasible and I do now carry a spare folding tire (SOMA B) which I hope is for a problem that is too rare to worry about. I justify carrying the "extra weight" by switiching both tire and tube when there is a flat which save a good several minutes and allows me to repair the flat and check for the item that caused it after the ride is done. If I have to change a flat in the dark, cold or rain or all of the above, swapping out everything and dealing with it later is the way to go.
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