Door # 7 - knotless or, if you can get it...give Fir a try.
Laminating 2 boards to get to a 2" + thickness is a decent idea that to my mind adds some tensile strength and a bit of ductility to the blades. Offset the grains so they are opposite each other. I don't mean cross sectional but looking at the ends of the boards, some will have grain at a 45 deg going one way ... so use the next board with the grain going the other direction..if ya know what I mean..??
As for glue I have used Pro-bond (Same as Gorilla glue - but half the price), and am totally satisfied with the results. Awesome polyeurathane glue that once set is impervious to water/moisture - make sure to moisten the boards before glueing. As well it (the glue), is absolutely not an issue when carving.
Ya gotta use a ton of clamps...Can't hurt eh.?
As for carving..a wise man here once suggested using a rasp along with check cuts and a good chisel ... I did as suggested and it worked absolutely perfectly ... rasp (open blade type from Lee Valley), was aggresive for removal yet precise enough to keep to your drop lines et all.
rgds,
stk