As already mentioned,the caps attach with 3-m tape that is pre-applied.Yes,they can be removed.
Just a personal taste,I don't like the chrome caps.A bit too much.However,given my design background
(its what I do),the Soul needs some chrome touches.My 013 plus is also titanium.I looked at the vehicle for awhile
to come up with a looks "enhancement" plan.Thought about the chrome mirror caps and door pull covers.
Decided on adding 1/2" chrome trim to the lower sides right before the textured covering.I also used 1/4"
chrome at the tops of the doors below the windows to balance the chrome.I used the same 1/4" on the outside
mirrors above the black .Very subtle mods but they work to give the Soul a richer look.Also added carbon fiber B
pillar covers and fuel door cover.I was going for more of a Euro Range Rover look.
These changes IMO would only work best on titanium.