Not been on for a few days but looks like you've been busy, Mark!
I wonder when they actually changed those front bolts for the "later" types then. I just (wrongly) thought it would have come with the facelift! I'm guessing you can probably use the replacement bolts though as the threads are quite long and should take a nut the other side?
I think you're gonna need heat to be applied before they even think of shifting. I used a lot of blowtorch power to get both ends of mine done, in conjunction with the freeze spray (obviously not both immediately together!!)
Unlucky with the lower rear bolt. Not a lot you can replace that with other than a new one unfortunately. And yeah those droplink nuts can be hours of fun. Put TWO on each thread when you replace them - they'll come straight off next time you need them to!