The power button replacement is possible for this device. It’s a bit tricky to complete without soldering experience. Here is a [https://www.youtube.com/watch?v=6h-cTz-XcJk|teardown guide] on how to open the device and remove the logic board.
Once completed, the power button can be de-soldered and a new one attached to the logic board. Here is what the [https://www.ebay.com/itm/5x-On-Off-Power-Supply-Volume-Button-Switch-For-Samsung-Galaxy-S4-S3-i9500-i9300/201761519554?hash=item2ef9ec77c2:g:QE4AAOSw78xcz2yW|replacement part] looks like. The process is very similar to the [https://www.youtube.com/watch?v=Vc2o2vPED54|Samsung Galaxy S4 power button replacement].