Oh yes I agree, sorry I misunderstood your post as saying it is limited to a 90° approach, it’s surprising how often I see that.
Easiest in my opinion is to do vector analysis. Anywhere on the map, draw the target course as a line, and make it a length equal to its speed, can be an arbitrary number but must include that number. Say if the target is going 6 knots, you can make it 6 m, 600 m, 6000, whatever, you get the idea. Now draw a line from target back toward your “boat”, with the protractor so you make the angle equal to the AOB you intend to shoot at. Make it an indefinite length but sufficiently long. That is the bearing line. Important: The angle between that line and the target course line you must make the AOB intended at the shot.
In similar fashion to how you drew the target speed vector using an arbitrary unit, do the same for torpedo speed. So if you are using a 30 kn eel, and you used 600 m for the target speed vector, use 3000 m for your torpedo vector. From the end of the target vector, draw a line 3000 m long, and where the other end of that line rests on the bearing line to the target, that is the third leg of the triangle. Measure the angle between the bearing line and the line you just drew - that is the lead angle, and depending on target bow right/left, that angle will be the shoot bearing (subtract from 360 if bow right).
Drawing this simple triangle is very flexible, and you can play around with it if you would instead like to predetermine an impact angle instead of an AOB, etc., by manipulating those two angles.
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