例证5改为while是完全正确的。因为while作引导词时意思也有“虽然”的意思。
来自柯林斯词典：
You use while, before making a statement, in order to introduce information that partly conflicts with your statement. 虽然 (用于发表陈述之前，引入和陈述内容部分矛盾的信息)
While the news, so far, has been good, there may be days ahead when it is bad.
虽然到目前为止都是好消息，但是可能过几天就有坏消息了。