Very correct that it's not longer emergency funds if it finds it's way into Bitcoin. The speculation that emergency won't even happen thereby seeing the reason to save emergency funds in Bitcoin is a bad one because in the first place it's not as if you expect any unfortunate circumstances but life happens to us all! Having your emergency funds in Bitcoin means investing every funds available to you and tempering your Bitcoin at any given time. This idea will affect your Bitcoin in many ways, Bitcoin might fall below the dollar rate you inputted and while withdrawing, you withdraw based on the required dollars amount and by that your Bitcoin value will automatically lessen.
It is always best to keep the emergency fund in fiat currency or you can keep it in a place where you can use it very quickly like fiat currency. But if we divide the emergency fund into two parts like 50% in fiat currency and 50% in dollars. In this way, if a person keeps an emergency fund, it will not be a bad decision. If we use the emergency fund kept in fiat currency as soon as we face an emergency situation and later if we use dollars, we can use it in this way too.
The emergency fund should not be kept in a place where you cannot easily access your funds.
Splitting it like you said will also make sense, as long as the funds still give that quick access when something urgent comes up. Because that fast access matters more than anything when it comes to emergency matters.
