Split into groups of 2, don't look like douchebags (no collared or anything remotely dressy, wear blacks and greys, tshirt or sweater/hood) and go to Ipse. The door there seems a little easier than most. Has an indoor and outdoor stage most the time. Same for ritter butke. If you go up not too eager or chatty, you should be good to go. Obviously try your luck at berghain although your a bit short on time for it so may not want to waste your time in line. Kater is Good Friday but tough door...id pull strings for list for that party.
Ritter butzke has tix for sale Friday, Ipse and ://about blank have tix for Saturday. ://about blank party Saturday looks nice.
https://www.residentadvisor.net/event.aspx?948046