Been thinking about your T7 headache... I went through the same thing last year when I tried doing some long exposure work at a local lake. It is super annoying that they stripped that port. Using the app sounds fine on paper but my phone battery just tanked in the cold, which is exactly what you dont want in Glacier. The fix for me was finding a wired remote that actually plugs straight into the Mini-USB port instead of the usual 2.5mm jack. Picking up the JJC USB Wired Remote Shutter Release for Canon EOS Rebel T7 honestly saved my night. It feels a bit weird plugging a remote into the USB side, but it works perfectly. No lag and I dont have to worry about my phone disconnecting or the Wi-Fi signal dropping out in the middle of a 30-second exposure. The cable is plenty long and it doesnt feel like it's gonna snap off. Plus it was way under forty bucks. Just make sure your camera settings are set to allow remote triggers... I spent like twenty minutes fumbling with menus in the dark before I realized I just needed to be in the right drive mode. It's way more reliable for astro than messing with a touch screen with freezing fingers when you're trying to stay steady.

Honestly, the Canon Camera Connect App is your best bet for wireless.

• no extra gear
• zero shake Ive used it for years and its way more reliable than cheap triggers.

^ This. Also, you might want to consider the physical strain on that Mini-USB port while you're out in the field. I would suggest a methodical approach to how you're connecting things in the dark. First, make sure you're using a cable with a right-angle connector if possible to reduce leverage. Second, be careful with the port housing because the T7 uses a relatively thin mounting for that internal board. If you snap a pin in the cold, a professional repair will definitely exceed your budget and might even cost as much as a used body. Glacier is such a vibe tho, you're gonna have a blast. I remember the last time I was up there, the road construction near Lake McDonald was a total nightmare. I spent nearly an hour just sitting in my car waiting for the pilot truck to show up. I ended up chatting with this guy in the lane next to me who was moving his whole life in a small trailer. He had this massive collection of vintage clocks that he was worried would get damaged by the vibrations on the gravel parts of the road. We spent the whole time talking about how to properly oil a grandfather clock. Anyway lol sorry kinda went off topic there.