I think that will be wonderful! Honestly having the ironsights in first person is an amazing idea. Imagine, if you can make it so that it is a server option, if people are allowed to only look through First Person. Imagine reliving the time period in such an amazing way. Imagine all the regimental Linebattles when people get in a line and fire. It will be amazing. I support this fully.
Note: Making a server option available for only First Person View, then it could create some amazing servers and more historical hardcore events.