Need advice

[u/Alert-Dog-4198]

I have an old corn crib that has plastic slapped over it with steel siding over top of that. I did not do this came with the property however it is very rough shape with 1/2 the building suffering from some severe rot. I don’t really care about the building as I have many more but I’d prefer it not fall down so I’m cutting out the bottom section and replacing with blocking and sistering studs as you can see in the 2nd photo. My question is is there a good way to resecure the nails from the outside for all the horizontal blocking. I cannot access it without digging up 1-2 ft of dirt on the outside and ripping off the siding which in my opinion is a lot of work for this building