Not against the rules to give suggestions.
Suggestion #1: Leave the Hawkeye alone, or send it to a smith to get it as close to original as possible.
Suggestion #2: Leave the BF alone.
Elgin had some good ideas and most of them have been tried, re-hashed, tried again, etc. etc. If you want a longer neck BF, get hold of Eben Brown and have him make you what you want. He is easy to work with. Don't mess up the Hawkeye with any of Elgin's wildcats. It is not worth the expense nor the headaches you will encounter. I have most of those 7mm wildcats and I would not shoot any of them in a revolver or breech loader like the Hawkeye.
I have played the games, spent the money, and kicked myself over it several times. It is great to have ideas. You need to keep working on them. It is smart to talk them over and listen to pro's and con's. I am sorry, but on these two, I can come up with no Pros and a lot of Cons.
Just a nickels worth for free.....
Steve