So I started desoldering my ES87 last night and it didn't go so well. My solder pump turned out to be defective, shame it was a nice model. I damaged one of the switches, but I'll transplant the stem into a spare gateron brown housing.
I ordered a new pump based on recommendations from I:C, the engineer SS-20. By chance I discovered that adafruit has the lowest price by far. They must have some deal with engineer where they don't advertise the manufacturer because the picture clearly shows it's an SS-20. It's also about half the cost of Amazon, so well worth it.
Hopefully I can finish this up next week. I was going to use some spare brown springs I have, but after reading around ordered some 65g Sprit springs instead. I did test a brown springs and it felt much nicer than the stock clear spring.