Accumulating Bitcoin before getting married does seem much better, but that doesn't mean that every married person can't do something like that now. Because everything we do is based on a plan and also based on a path that we can take, so getting married does not mean it is an obstacle to being able to continue collecting Bitcoins using the DCA method.
Investing in bitcoin before or after marriage doesn't mean anything because it does not guarantee your success in your bitcoin journey if it is not done the right way. What matter when one wants to invest in bitcoin is have the resources available to but bitcoin frequently from your discretionary income without overdoing it that it will affect you later. Bitcoin investment is for all whether married or not married.
If not planned properly, marriage life brings about additional responsibilities that might affect the finances of a newly married man, also at my country, a lot of money is expended in the marriage execution processes that the man takes some time to recover from. It might reduce his accumulation strength, but if he has a very strong source of funds, then he would just continue without any altercation in his accumulation strategy.
I do not really see much challenge here because the essence of making investment is to be able to solve personal problems from the proceeds of such investments and we in this sphere chose Bitcoin so it will not be bad seeing that someone is able to get married and raise a family through the part of the proceeds of his Bitcoin investment. What I see that is bad is selling off ones entire Bitcoin to use the money for marriage ceremony. This is bad because marriage bring additional responsibilities so having investment in Bitcoin will be a wonderful leverage.
Like you rightly said, marriage should be planned properly in such a way that it does not hinder the investment even though it might require adjustment of the DCA amount by pushing more funds from the DCA money to the reserve funds to accommodate the marriage and family requirement. As long as the DCA method is running smoothly even with reduced capital, I feel it is fine.