Even with a resistance solder machine there's a small the risk of discolouring a dial due to heat, I haven't done so to date but it's always a worry!
Here's a speedy dial I did, new feet had previously been araldited to the dial but the job didn't hold.
To get a strong joint you need to thoroughly clean the area where the feet are going to be soldered to first.
New legs were then soldered into position, the positioning is acutely critical, especially with a chronograph dial.
Then they were trimmed to the correct length.
And very importantly no damage to the printed side of the dial.