The 'clips' are heat welded onto the main cover so will need to be broken to be removed I'm afraid. When done just glue the centre strip back on.
I removed centre panel of my engine cover by first removing the some of the plastic weld at each attached point beneath cover,to show four slots where the silver plastic meets black cover,using a sharp blade cut each slot as deep as you can ,slowly remove centre panel ,checking each slot has been cut free,our you will break cover ,hope this helps:drinking: