So I decided to go through with my idea of putting in a bolt and Pratley Steel it in, then I realized that so far most of the comments were about the new plug still having leaks even after all the hassle to get it out, so in my case the leak was NOT sprayer but a drip, so I drained the cooling system, cleaned out the plug with some degreaser and steel wool, then rinsed out and wiped dry. I mixed the Pratley Steel and applied it to the inside of the plug with a tiny paint brush almost painting it on and left to dry for 24 hours. Filled up the cooling system and ran the engine till fan came on and NO MORE drip. For added measure I mixed up more Pratley Steel, applied it to the head of a 13mm bolt and stuck it in head first and allowed to dry for 24 hours. NO MORE leak and kept the original plug in place. Based on others experience of Pratley Steel lasting 10 years plus, I think I will stick with this plan for now...
The brass fitting is still solid with NO leaks as well.
Will update if the above starts to fail, fingers crossed.
Took some pictures,but not sure how to insert into a post?