Sorry I think 2nd point will not work. Because NSP and SPP spilt before called SDA( NSP,SPP,PKMS,SJP). Actually are stupid arrangement so many party join together with so many head want to be leader.
Let the weaker party die off. No need to merge later cause problem again and split.
After this expect SDA and RP will disband.
Only left PAP, WP, NSP, SPP and SDP(will never give up untill CSJ settle score with LKY). Hope only see these party in next election. If SDA & RP want to fight in next election go for 3 corner fight let them lose deposit .