Omnipod for the win. But, yeah, I have a bunch of disposable needles in my kit as a backup.
Even so, travel is stressful. My carry on is full of backup pods/sensors. But now that my insurance is being annoying and only filling a month at a time, I don't always have an extra...
I'm fortunate to have the income to support buying backups when I had insurance issues. During the Dexcom G6/G7 switchover and the switch to the Omnipod, I had just filled a bunch of G7s but the Omnipod didn't support it yet, so I ended up having to buy G6s out of pocket. Even with coupons from the manufacturer, it was still costing me $200/month.
When I lived there (or visit family), a Costco Gold card and store pharmacy visit can help a lot - it was around $150/mo for G6 last September. I'll switch over to G7 some time this summer. The Costco plan more than pays for itself using the built-in rewards program and rx discounts if you're paying out-of-pocket.