No, the variables paypal will accept and show in the email are:
Amount
Name
Number
Quantity
you will not nbe able to remove the item ID from the email.
what you can do, is concatenate the options onto the item name:
$WA_PP_ECO_Do_itemized[0][$nextIndex] = "Name" . strval($cartIndex+1) . "";
$WA_PP_ECO_Do_itemized[0][$nextIndex] = "".$hgbCart->DisplayInfo("Name") ." Option:"".$hgbCart->DisplayInfo("Option") ."";