As someone that travels for a living…. And goes to dedicated writing retreats every so often, I can offer some general advice for you about digital writing.
First, do not wait until you are there to test your desired setup. Don’t squander your vacation time by diagnosing and troubleshooting when you’d rather be writing.
Second, less is not always more. Taking an Apple wireless keyboard you are comfortable with for use with your phone is a solid idea, but you might be setting yourself up for eyestrain. For mobile writing where I don’t want to dig out my MacBook I use a iPad with a keyboard case. I also have downloaded movies and music to said iPad too, and it works good for that, especially when paired with headphones.
Third, make sure you can charge anything with a battery. Don’t count on having access to wall-power all the time either. A 20Amp/hr battery pack (usually marketed as 20,000mA/hr) is perfect for phone, headphones, and keyboard.
Fourth, a phone or table stand is a must.
Fifth, folding keyboards are a crapshoot. Some are good, connect and reconnect easily, and are nice to have, others are garbage. I have a phone-sized keyboard with case that doubles as a stand. It takes a little getting used to and it wasn’t that expensive on Amazon.
If you’d rather be seen as neo-erudite hipster, then they make keyboards with an integrated device holder such as this one.
But it’s expensive, and bulky to try and pack.
The biggest thing I can suggest is try out what you want to take with you, learn how it behaves when it connects, disconnects, and reconnects. And bringing paper and implements is a great backup idea. Since you mentioned a tent, see if you can get one or more ziplock baggies large enough to fit your writing kit in. If it starts to rain you’ll want the protection, but it doubles as organizational too.
And lastly, the sin I keep committing, don’t pack too much gear. I never use it all, and I’m always missing something anyway.
Share pics, sounds like fun.