Go for 500k pots - a good brand like CTS
USe a 0.022uF cap - and maybe a Sprague Orange drop one
An OAK or CRL 5 way switch (made in same factory) and a switchcraft jack will do just nicely
Should set you back about £20
The Apaches are nice warm sounding single coils , so the 500k pots wont make them overly bright IMO
Sounds like a great upgrade