You can do all for turbo flange bolts with a gear wrench from above by reaching around and under the turbo. I would take that route over the full manifold pull, the support bracket is a pain in the arse. Once you have the four nuts off the flange you will need to pull the clamps on the "accordion" and remove the bolts that attach the flange at the rear of the accordion to get the it out of the way to pull the turbo off.

I have a good one with about 50K on a rebuild if you are interested.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine