I'd not carry a replacement. There should be a replacement schedule. Use it, plan on where you'll be a bit before the schedule and have a replacement waiting for you there. It is not too hard.
A prefilter is a good idea .. knocks out the coarser dirt particles. Prefilters do a good job - no glue so you can clean them in petrol, use engine oil on them, they are cheap and being fabric pack down small. So you can carry spares easily. Put them over the air box inlet and your good to go.
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