Considering bitcoin investment as emergency money doesn't seem a bright idea because this will mean that once you need the money you should sell it a market value and sometimes it could be below your entry point.
The exit strategy is a long time movement because you must wait for the right price to convert your money into fiat so you won't be able to have access to your funds right away.
Emergency money should be in fiat.
Yes i agree in this thing because the bitcoins are not stable so the price you will hold can either go up and down so whenever you need money and the price of the bitcoins into the market are on their lowest then that is a bad time to sell it because you will lose a lot of money but you really need money so you will sell it anyways so that is a bad decision. We better have a lot of savings and better stick wil cash savings when it is in Emergency for us to have a stable amount. Bitcoins investment is not meant for Emergency thing but you can always