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@.gaz.
Heard back from Billy this morning and it seems my idea for the bilam head tube is probably not a goer. The tongue part ('licking' the underside of the top tube) has to fit over an already-brazed top tube / head tube fillet, and so would be extremely tricky to make the right shape.
The other problem is having the bottom 'lug' start halfway round the head tube. I didn't realise that the lower part of the 'lug' also functions as a reinforcement to the bottom edge of the head tube as it wraps all the way around. Without it you either have to add a reinforcing ring (not aesthetically great with this particular bilam design), or risk a failure in that area (presumably what the Icarus is doing). The reinforcing ring would ruin the design so that's a no go.
So... looks like it's heading more in the direction of the black Gilco frame above, which is no bad thing
: )