I've done key changes by simply using the chords in the new key. It has always worked well for me.

This is one such example. Nothing fancy, just started entering the chords for the modulation

https://www.soundclick.com/share.cfm?id=10762744


You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.