Removing dental implants for braces - How difficult is this procedure and what are the dangers / risks?

Utilizing digital technology in both orthodontics and implant planning a specialist should be able to simulate the planned tooth movements to see if removing the implants is absolutely necessary. As a prosthodontist we work closely with other specialist like orthodontist to pre plan treatment using digital technology.

Ideally Teeth alignment should have been done before alignment. But if you already have got implants those cant be moved unfortunately. i still suggest you discuss with an implant specialist. Possibly what can be done in your case is a combination of treatment like natural teeth other than implants can we moved and implant crowns/caps can be redesigned after alignment is over.
Still if implants become unusable after alignment, its better to leave them submerged in bone so that when you lose rest of your natural teeth in your 60s /70s that submerged implant would still be usable. but going for invasive procedure of removal of implant unnecessarity should be avoided at all costs. Good luck!
I will be able to advise you better if you can share close up images of teeth that will help.

Removing dental implants are done routinely in several situations. A good dentist or surgeon should be able to do this without much issue. It is not a dangerous procedure but getting it done by the right person is key.