Success!!
Stainless steel parts magically glued (courtesy of gillm) so the EVOMS cover is now fully repaired and ready to fit.
A new thread with tips how to improve the standard EVOMS engine cover will be posted tomorrow.
^ The screw has been glued in position so it forms a fixed 'peg' and saves extremely tricky fiddling with fingers under the cover each time you want to remove/replace the engine cover.