I found the M10 XZN MB # 601 589 00 10 00 HAZET #2751 tool available from my local dealership for about $17, that's with no discount! Which is at least $10-15 less expensive than anywhere else! Might take a couple days to get it though. Usually when removing these bolts I've found the best way is with enough extension/s to get the inpact wrench outside the wheel hub and a universal joint right after the tool to allow it to get a nice straight and square contact with the bolt head, but with the subframe completely out you might be able to get the impact and tool in from the top and get a good shot at the bolts from that angle.

Excellent ... I have to go to the dealer anyway to pick up a few bolts and tidbits, so I'll ask if they can get it.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)

You'll need it when you get to rebuilding the engine anyway!