I'll reconsider the Osiris/Isis/Horus connection with relation to the changeover from a stellar-based worship to a solar-based one. Where I stop though, is when Osiris & Isis are worshipped in every nome in Egypt as a variant on the original with different names, powers, myths etc. My wont is to go as close as possible to the original as possible. Difficult, of course.
Actually, for reasons just mentioned, I was not aware of the differing personas of Osiris which you have brought to my attention. Very interesting.
As for plotting lines, it's relatively simple and can be revealing.
1. Download Google Earth (probably already have).
2. Click on Tools.
3. Click on Ruler. (A new window pops up where you can choose kms, miles etc.)
4. Click on Line.
5. Move your Mouse over to the Main Screen where a Target Box will appear.
6. Left Click on your target - Site 1.
7. Drag your Mouse to wherever you want to go - Site 2. A yellow line will appear.
8. Left Click on Site 2.
9. Move Mouse back to Ruler window and click Save.
10. A new window called New Path will appear.
11. In the field titled Name enter whatever you wish to call your line.
12. Click on OK at bottom.
13. All of your lines will be saved under Places on the Left Sidebar. You can untick or delete these according to preference.
14. You can use Scroll Wheel to zoom in or out for getting exactly where you want.
Have a go. It's pretty easy.