Shimano 105 is not very cheap chain.
And I have much doubts that you can disassemble it easily without danger of
total chain destroy.
Construction of 73/93/DuraAce chain does not permit it to be re-assembled
without new special lock chain link. Even if you oil link which is subject
to be broken.

It's a problem with cheap and nasty chains. After a while though, you do
get
good at breaking chains though. Oiling the link before breaking it can do
wonders (would you believe???). And naturally breaking it at a different
point each time makes sense.