No no, just base yourself on an existing copper WB, for example a TC-4. Take its base thickness (without turbulators) and compute the best silver plate thickness to spread the heat evenly without diminishing returns. Intuitively it would be rather thin, we want maximum radial diffusion on that layer, with minimal transversal diffusion.
Myv65, you said that electroplating could yield a 300ยต layer, i think it would be more than enough. And that, as an extra bonus added to surface quality.
(edit) ha meltman posted while i was typing. Hmmm good idea, but not for the faint hearted

Acetylene torch you said ? mmhhhhh (/me looks crazy) nyark nyark nyark mmmmhhhhh nevermind.
(edit of the edit) that what i'm holding on the photo.