Ride, Wrench, Swap, Race
Join Date: Jan 2010
Location: Northern California
Posts: 9,194
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
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An extra-long strip of shim stock along each of the internal flats of the crankarm could effect a compression-fit upon installation of the crankarm.
The extra length should be toward the inside face of the arm, so that the shim can't move away from the targeted areas of contact.
The shims can be trimmed away after installation, difficult as that might be(?).
All this assuming that the OP can find the needed spindle and cups/bearings to position the spindle properly.
Viscount's pressed bb spindles had troublesome circlip grooves in them that can cause cracks to form.
And their bolt threading is NOT standard so you need the special bolts.
Prognosis: Grim.