Thanks alo.
I believe I have. After a rudimentary understandings of the various options I ultimately decided to base my decision on the needs for this old Bike of mine. Since my needs are Recreational and not what I would call heavy regular use, I had to weight cost and time into my decision process. So in the end I decided simply to follow, Lester's idea to purchase Handlebars with a rise. So I purchased New Handlebars with a rise of 80mm (3.1") and I believe this will be more than sufficient for my use. This will allow me to be up and riding this bike in a short time with the least amount of time and effort spent. A new front brake cable will most likely be needed, but that was likely inevitability anyways no matter what method I chose to raise my handlebars.
Your idea of finding the Quill Stem parts from older bikes, etc. is an interesting one and as a Sheet Metal Mechanic would not be outside my skill set with regards to any cutting, welding, fabrication, etc. However, I would still have to start searching for parts and then when, or if, I found the right ones put in the time/energy to manufacture them. This sounded like more time and frankly energy then I wanted to invest in this modification. However, the idea of keeping my eyes open for Old discarded Bikes and their salvageable parts is a fabulous one going forward now that I am considering getting back into a riding again.
The idea of a Quill Extender was my first thought during this research and I might have done that if I could have found the 28.6 mm diameter Quill Stem extender. I do not believe at this time there is any suppliers of this product and its older spec. I will say that the more research I did the more I started to have some reservation about using one anyways. There seems to be a lot of mixed opinions about their reliability and strength. Being a heavy set guy there is no doubt that I would be hitting the testing limits of any Extension of my Stem Quill. I know the one I am using now has proven itself up to the task. I is likely because it is a short Stem Quill at 42mm (1.7") maximum height ability, so there is little to no real give.
Lastly, the suggestion of a replacement of my Quill type Stem to a Thread less concept. This was the most appealing for many different reasons. However, it was also the most expensive and like I stated when I started this thread my personal needs for this Bike did not justify it to me.
So I want to thank all for your ideas and this forum for providing Newbs like me a place to bounce ideas in.
Stay Safe All