There are more pines that can be rooted from cuttings but it helps to have the correct conditions. Mostly we believe it can't be done because someone said so and have not tried. I've rooted JBP, JRP, JWP and Radiata - not cultivars, just species. Success rate is low so not commercially viable but still can be done.
I would give those seeds a go. Most seeds are viable well before the cones/pods/fruit are completely ripe. Some species with complex dormancy requirements can germinate without treatment if using immature seed. It seems the embryo matures early and it's all the additional stuff that gets added in the final stretch to complete maturity, including storability so although they may be viable and germinate if sown immediately, they usually don't store well.
@Wires_Guy_wires has said it all.
Pines are difficult at the best of times with the freshest shoots. If the roots are still partly intact and some branches are still healthy you may have an outside chance but I don't like the odds after the tree has been down for any length of time.