You will have to remove the manifold. Use a long reach Torx40 to avoid braking off the CCV fittings.

Search for and read advice on GP removal on the 606 engine. Here's a couple:
W210 broken glow plug removal - plan to make a nice DIY post.
PeachPartsWiki: Broken Glow Plug Removal

Good luck.

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Greg
2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO

get the engine hot and toasty warm - more like 100C on the gauge, then unscrew the plugs. They are known for siezing in the head.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)