My own pieces of advice:
1.) If they actually requested for original employment documents, then don't send photocopies.
2.) You may look for where u can make photocopy in Colour for your keep, while you submit the originals. If there is any Audit (there may not be any until you are through with Accra), you may present the coloured photocopies. If they query you, then you can explain to them. Meanwhile, if the colour photocopies are done very well and laminated well, nobody may know they are photocopies.
3.) Concerning your late hubby, you will need to inform Accra about it with all the necessary evidence (like death cert, etc); and then remove his name from the form accordingly.
I hope I've tried. Other forum members please, respond.