OK
With HIF6 if the cold start, or choke, or enrichment device - call it whatever you like, is not working the car wont start.
Get a trigger spray bottle and put some fuel in it, remove the carb elbows and have an assistant spray some fuel into the carbs while you crank it.
If no go, then you will have to remove the carbs and see if the float chambers have fuel in them, this means taking the bottom off.
The square section O ring will swell and not go back, I have successfully cut them with a Stanley blade and super glued together as a temporary repair.
If you have fuel in the float chambers, and a spark at the right time it should run.
You keep mentioning you have established TDC on number 1, but you have not confirmed that it is on its compression stroke.
You need to confirm this and point the rotor arm at number 1 post on the cap whilst the crank is at 10 degrees before TDC on that correct stroke.