Truly money can resolve our urgent needs but in some cases when money is not available, the available should go in for it or possibly take the place of the money to solve the problem. Most times things happen that no one bargained for but you will have no option but to respond accordingly. These experiences are sometimes among the reasons one needs to invest. Irrespective of the nature of the investment, for instance, bitcoin that you have direct access to when you are in urgent need that requires a financial commitment and you have no cash at hand and in your account but you have crypto assets. It is expected of you to sort yourself out. That is good because when you have enough to sustain yourself and more, you invest the excess so as to serve you when you are in urgent need and the investment as the case may generate income as time goes by.
I am trying to gather fact on what you said here.
Do you mean funds can be used to invest in Bitcoin, just to keep as emergency fund? Or you mean at a point of emergency the best option to resolve problems is by tampering ones investment.
I do not think it necessary to invest your emergency fund in Bitcoin, because you are not yet into sorting out any issue at that moment and you feel using the money to invest is the best. The rate of Volatility in Bitcoin is high and you are placing yourself at a 50:50 risk. I believe it is not advisable.
I also think there are better option when your emergency fund can't meet up with challenges at the time instead of tampering with your investment. A loan can be collected from Family, Freinds or any Financial services but not your investment