If you have an 8mm wire then I'd guess the solid snakehead will be about 16mm+/-. Might present a weight problem depending on if its a ring or something else
I would carve a snakes head in 365 (3-D top and bottom) in hard green
wax and then saw it in 1/2 (a top & a bottom) and hollow it out - now
you have two halves- I would carve tabs (Male & female) so the 2
pieces clicked together. Now You can cast 2 light halves and either
solder or rivit together and they won’t have a lot weight.
Mary R