You are biting off a lot but I'll go through your ideas and perhaps make a few suggestions. The big issue here is to react the huge bending moment as it passes through the bend in the spar. This is a considerable force if you assume that the lifting forces are all on this outboard wing and the inner portion is providing no lift. If you assume that the center of all this lift is at 1/2 the remaining span you can see that the moment is substantial. This moment needs a continuous metal structure to carry it. Don't forget to add the g factors required.
I have a couple of ideas:
1: Aluminum I-beam with aluminum web with t shaped extrusions with notches cut in the leg of the T where the piece has to bend around the web.
Rather than cut the notches and bend the remaining flange. It would be better to cut the spar at the precise angles necessary and then add gusset plates to the joint on both sides. These would then be riveted or better yet, bolted together with HiLocks and Hilock collars. These gussets should not only bolt to the web of the I-beam (not a "T" section) but also through the flanges. Here you have two options. You can machine the gussets out of plate stock and make them fit on all three sides, OR make them up out of machined fittings our of bar stock and use an additional web only gusset cut and profiled. Again, you need to make a continuous amount of metal to carry this large moment. Once the loads are known proper sizing may dictate the selection of the exact configuration.
2: Make a steel tube truss type spar that would be integrated into a steel tube fuselage. The curves in the spar would be accomplished by bending the tube. Downside is that bending tubes can cause cracks when welded, although my preliminary design has all welds at the ends of the bends.
This option is OK IF you have adequate bracing as metal that is bent already has some odd metallurgical properties that are hard to design with. In most cases it is easier to do something similar to what is described above using sockets (internally or externally). Also, I've never liked tubes (round I presume) for essentially uniplanar loads anyway as the properties required sometimes get you into a larger and heavier structure than what is really needed.
If you want a quick picture of the concept for your Option 1, reply requesting one.