Personally I would pick out the idea of buying in lump sum when not currently in the DIP, this could be an inappropriate behavior for me and would prefer just dividing into two parts, one for the DCA and the other for the DIP. He who wants to use the lump sum strategy should get ready to tye his/her tail to a very longer investment than he would when using any of the others.
Lump sum is actually a very good method to be used in times of Bitcoin accumulation but however is mostly use by people that has huge sum of money because it has to do with buying a whole lot of Bitcoin at a time but however is a very stressful strategy because you will need be constantly watching the market or setting your notifications that if the Bitcoin price gets to a particular level it should notify you, so perhaps with that you can regularly monitor the price of Bitcoin incase it dipps you take advantage by Lump sum.
But however in times of using lump sum strategy I believe there should be need to have a back up plan because the possibility of Bitcoin getting to the particular point an investor tend to buy may not be certain and sometimes it could take a very long time before the price could get there, so perhaps in a case like that an investor should be able to navigate through other ways of accumulating Bitcoin by using DCA method in other to keep his accumulation running while he wait for the main strategy.