Investing in the DCA approach must be long-term and have the capacity to take risks. A separate fund must be kept for long-term holding as the family needs to be met from external sources of income from that separate schedule. If there is no different funding then Bitcoin will be held off for a long period of time. This holding can be affected to meet the needs of the family. That is why a separate fund is definitely needed to save Bitcoin holdings.
Reading over and over again, I still don't get your points in full, but from the little I think you trying to say DCA is usually a long term investment and one should be able to abide by the risk of not selling too quick even after seeing the price increase a little. Yes, there must be a separate funds kept aside, called the emergency funds and also have a steady income as to be able to meet one's cost of living. It will be very unwise to live from one's Bitcoin portfolio, it is best to invest from the left over funds after much calculations of expenditures for the household and having set aside that for emergency purposes.