A BuildCraft filler should have no problem harvesting a bloodwood tree, except that after it finishes clearing the tree it needs to be manually reset. Workaround: set up a cobble generator in the last spot it clears out.
They might be plantable with Autonomous Activators aiming upwards - I haven't tried it.
If you have any mod that can move blocks a long way (RIM, Truss Mod, MFFS, or something else) you could move an Autonomous Activator underneath the dirt block, plant the sapling, then move it out of the way again.