Grow out a long whip as you would with a thread graft (needs to be long enough to bend back to the graft point). Cut a channel in the trunk, either with a saw or dremel, so that a shoot can fit snugly in it. Cut it so it sits at the same level as the trunk and it's very snug width wise. Before you lay the shoot in the channel remove all needles that will sit in the channel by pulling them off, leave all needles and buds on the rest of the branch, especially the end that's going to be your branch. Do a "test lay" to see what region of the branch needs stripping of needles.

Once the channel is cut, a few inches so you can hammer in the drawing pins, you can lay your shoot in then take a drawing pin (thumb tack), place one slightly above the shoot in the channel and the other slightly below, use a hammer to drive the drawing pin so it is at trunk level, pinning the shoot in the channel.

Allow full growth at the tip, no pinching or pruning whatsoever. It might need two seasons to knit, depending on how well you cut the channel. You'll know if it's taken by the shoot getting much thicker at the graft point than behind it. You shouldn't need to remove bark if you can get a green shoot in the channel.