Harbor Freight has a cheap handheld plastic rivet tool that is great for working on these things. Have used it with OE plastic rivets as well as aftermarket ones ordered on Amazon and it works great with all. The rivets it comes with are cheap and have a failure rate of about 10% but even they work for somethings.
It's compact too, though still requires wheel/tire removal to do the fender arches.

https://www.harborfreight.com/hand-t...ets-97757.html

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)