I've updated my method that allows you to keep the original timing without having to do it yourself manually.

The short of it is: Make rough gif with actual timing > save timing to a small file > create proper gif without timing > apply prior timing file

Pretty much works for anything. Also works if you remove every 2nd frame if you plan on wanting to economise the gif. Just gotta create the rough gif with the 2s and then export the images with the 2s.