Propping timber frame for bifold doors

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Hi,

I've propped several brick houses before but this is the first timber frame. Putting 2.4m bifolds into the side of a timber frame house with wooden cladding on the outside. Joists for the first floor run parallel to the wall where the doors will be going - there's not much weight on this wall vs if they were perpendicular, but it'll still need props for a 2.4m span while the steel is slipped underneath (picture 4)

Highlighted joists in picture 1 is taking the weight of the upstairs cladding and half the roof presumably, but for supporting it with acrows the two methods I can think of are:
1. notch out the height of a strong boy and slip that underneath the joist, then slide the steel under that.
2. drill holes in the joist for needles and acrows either side, but presumably these would need to be pretty thick scaffold poles and smallish diameter so the joist wasn't totally ruined after.

Any other suggestions welcome.
 

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PS triangle in picture 3 is to illustrate monopitch roof trusses, there's thankfully more to the roof than that
 

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