You don't. Seriously. The point of an ergonomic keyboard is to touch-type. You won't learn to do that if you look at your keyboard.

Print your keyboard layout on a sheet of paper, and hang it next to your monitor. Now when you want to type a character, look it up on your sheet, and without looking at your fingers, type it. Try to remember the position like "left index finger, two lines above the rest line".

A sticker is probably cheapest

I learned Dvorak. It was a painful four months going from chicken pecking a few words per minute to touch-typing. I would echo this advice. DO NOT pop the keys off and replace them. There are too many things baked into the BIOS or when you reinstall the OS, and you need to find the right key on a QWERTY layout.

I know it's painful, but learn to type without looking at the keyboard. Print off a paper guide and place it below the monitor, and reference THAT when key hunting. Being able to touch-type is a serious superpower you will thank yourself for learning in the future.

I'd say there's no need for that. If you're switching to Colemak I assume you're gonna learn how to touch type with it, at which point it really doesnt matter what the labels on the keys say. Most typing websites like monkeytype have a finger position visualization so even while learning you dont need to look at your keyboard.

Depends on the laptop model.

Unless you have some business oriented laptop, the keyboard can not be replaced.

Laptop keyboard also are notorious for breaking when you try to replace a key.

So cheapest is stickers. But become sticky with residue after being used for a while.

Don't do that, if you get used to looking at the keys you will never truly learn to touch type. It's annoying for a couple of weeks to have the layout opened in a window until you've learned it, but the payback is great, I also use colemak and my current keyboard is all blanks anyways.

I don’t know where you are from, and what laptop you are using, but as others have said: use keyboard stickers. Just search for „colemak dh stickers [your laptop model]“

I have also switched to Colemak and my advice is to just not do that. Just learn Colemak without looking at the keyboard, it'll make you a better typist anyway and you can get comfortable with it within a few weeks. In particular you don't want to move the little knobs on the index finger keys (F and J).

oh wow another colemak-dh user

but I'd avoid converting until you're able to touch-type. then you can show off to everyone w/ your weird-looking keyboard layout lol

Yup, don't. People already covered why. I will add that I tried learning dvorak for quite a while and it didn't stick until I went cold turkey. It was very frustrating hunting and pecking for a couple days, but I made pretty quick progress. IIRC I was back up to 20-30 wpm after a week which was "usable" at least, and back to 60-70 wpm after a month. I had regular wrist pain before switching, and it was basically gone after. I don't think it helped my typing speed. Like I can do 90 in bursts for a bit longer, but generally I "cruise" much slower than that. ;)

Can't you pop off the keys and switch them around?