Check out this thread.
2 pins will work, but on the Blon, they stick way out and can be uncomfortable. These upgrade cables have the unique connector that comes on the Blon cable, so they work the way the Blon was originally intended. They took a while to ship from Aliexpress though but they are the nicest cables I’ve found for the Blon. The stock cable is pretty bad. You don’t need to change the cable especially if they are going to be beaters.
A very well known IEM You Tube reviewer has the Blon ranked in his S tier…
Other personal recommendations would be the IBasso IT00 (but some have had channel imbalance issues including myself). The Moondrop Starfield. I want to recommend the Urbanfun but can’t because of QC issues.