Alan, Till you can source a Pair of Legs. Why not use an SMLE Rifle in thier place?
The MKI AA Variant has a slot cut into the front Pivot Block on the Tripod. This 'Slot' is identical to the Bayonet Lug Profile on this Rifle.
It was designed deliberately for this purpose to be used in an Emergency Or if the AA Legs got damaged.
As an aside, it looks good Too!