It is definitely do-able!! You’re taking all of the right steps. I like to remind myself the mantra of “one is none and two is one,” in terms of packing backup supplies, insulin, and treatment for lows. For the hard manual labor, familiarize yourself with the “temporary basal rate” feature on your pump before you go, if you’re not already familiar, and use it on the days where you will be working very hard. This will help you avoid lows and avoid having to consume extra glucose to treat the low. Also, I second the suggestion of contacting your pump company to tell them you will be traveling and asking for a “loaner pump.” Most of the pump companies, to my knowledge, will provide you with one.
When I have traveled to Latin America, the diabetes was rarely an issue UNTIL I became very dehydrated. THEN, it did cause me a bit of a problem on one trip. So I would advise you to drink lots of BOTTLED water, be aware of altitude sickness if you’re changing elevations, and consciously work to avoid dehydration.
Good luck and have fun!!