The plastic sheet should hold up without problem. I just pulled the barriers off the 560, 16 years old, with no problem, then reattached when done. The secret is to be very careful, take your time and pull gently. For reattachment I used a small amount of 3M trim adhesive - a little one the door where the barrier attaches and a little around the edges of the sheet.
Should the barrier tear or otherwise come apart on you, simply use pieces of the 13 gallon white trash bags.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.