Check out the keychron lineup. They have some decent Bluetooth ones that work fine. I have the V6 pro and it has been serving me very well.

I have an Air75 from Nuphy that I love. Not super cheap, but it is a really nice low-profile mechanical keyboard. I was very impressed by the feel and quality of it. It works with either a dongle or Bluetooth. If I was buying one now I'd probably go with the Air60 v2 to make it a bit more compact.

I've been using the K380 and pebble mouse. It's not large, so probably not for you. You can buy the pebble 2 combo now. I bought a basic leather case for the k380 which works fine.

It got a weird issue a couple years in where it never powers down, so for travel I remove one of the AAA batteries and slide that into the case next to it. The pebble mouse has never acted up. A couple of keycaps on the k380 also fell off before I got to he case, so I would say that if you're carrying it in a backpack I'd definitely recommend getting a case.

Overall, though, it keeps chugging without much more issue. I also reconfigured the keycaps to reflect my Dvorak layout without any special tools.

This thing is a tank and works great.

https://www.lenovo.com/ca/en/p/accessories-and-software/keyboards-and-mice/keyboards/4y40x49493

Tried some of the smaller folding keyboards but found this to be the most comfortable and reliable

They don't sell it anymore, but I use this super cheap tablet one, which only cost me $6.88.

It's about the exact same length as the deck, and it has a flip out tablet stand that perfectly supports the steam deck.

I'm sure it's not as nice as a lot of the keyboards mentioned in this thread, but it's been perfect for me.

For portable use I love this keyboard: https://a.co/d/a1s6Slt

It's not the best option if you're just using it at home, though.

so I originally got mine for my PC and that’s where I mainly use it, but I also use it with my Steam Deck sometimes via Bluetooth

I have the Epomaker EK68 and it’s a 65% sized keyboard so it’s smaller than a full sized one but not too tiny. I find it nice because it’s not TOO compact but can slip into a backpack without taking up too much space. It can connect with USB, dongle, or Bluetooth and switches between them with a little switch on the back. It’s mechanical and you can swap the key switches for whatever type you want

Overall not too expensive either

K380 all the way. Compact and pairs simultaneously with three devices

I dont really use one for gaming ,but I have an epomaker which I really like (th80 pro) I sometimes use my phone as a Bluetooth keyboard when I need to type a lot/paste stuff from the phone/use a mouse when docked

I don't yet have it, but I'm looking at getting a Royal Kludge 70 RKS.

USB Wired / Bluetooth / 2.4 Ghz Chicklet

Has a 3150 mAh battery, claims to be able to hold a charge for two weeks of wireless usage.

Comes with the wrist rests, too, they're not an extra addon with more cost, as best I can tell.

Also, is split.

So... you could more easily use it while say, reclining, or use it for better ergonomics in a sitting position, also each half has 4 adjustable little leg thingymabobs to further get an ergonomically optimal wrist angle.

OP, if you're looking for a larger one, RK does make larger, mechanical keyboards, but not any that have say, a full numpad that also split apart.

Also again, grain of salt with all of this, I've not actually ever owned or used this KB, I am just also in a 'looking for a Steam Deck / PC keyboard' phase, and so far this one seems the best to me, in a 'most bang for your buck without breaking the bank' kind of way.

I have a number of Bluetooth keyboards and they all seem to work just fine with the steam deck. I think you can pick the keyboard you want style wise and you’ll be fine.

Keychron K17 max. Decently small footprint. Wired for the desktop, Bluetooth for the deck and rf for the rack kvm.