You’re not going to be able to do that lol. The only thing that’s changing is that you will only require tools that the average person wanting to do the job will already have in order to take your phone apart. No proprietary screws etc. The EU law basically changed nothing of any real meaning.
Nah, there’s basically no design changes needed. Pretty much everyone already complies with the new EU laws. People seem to think the new laws mean you’ll just be unclipping the back of your phone and chucking a new battery in like in the nokia days lol. All it means is that you won’t need proprietary tools to open your phone. You’ll still need to disassemble the phone as usual. Basically nothing changes for the big OEMs already. It’s not going to make replacing your battery on your own any easier.