Money seems to be an issue for you and most of your plans require buying stuff and having a lot of devices. So let me throw in a different plan:
If your Laptop is recent and powerful enough and you can upgrade the RAM (to 32 GB), consider using Windows in a virtual machine (Virt-Mnager (VMM) or VirtualBox). That would cover all your office needs.
For Video Editing there is Kdenlive or the paid Version of DaVinci Resolve, that work great on Linux. - The latter can be a pain to install though.
For your your phone. I’d recommend just a Google Pixel with GrapheneOS a FairPhone with /e/OS preinstalled. You can have work and private stuff on the same device and keep them separated, via a Work Profile (Shelter or Insular) or even different User Profiles.
If you did a digital detox, I assume you have problems with social media and their like. Waydroid is a great idea to get some separation from those toxic apps. Maybe go even further and setup a Raspberry Pi 500 with Waydroid, so you have a special place to indulge in unhealthy apps and they are not with you all the time. - And at least as important to separate yourself from unhealthy stuff, is to find healthier stuff to indulge in, that is at least equally accessible to you. - My thing is listening to audio books for example. I can do it anywhere, anytime and in any state of mind and I never regret the time “wasted“ on it.