I'll cost all the required items from the 3 suppliers you mentioned; they have good Aust online stores so all good.
Had a look at the E Stop switches and was surprised by their cost Aus $ 50 to $300 and more.
Will discuss item specifications with you prior to placing the order.
Hey Sherwood, fellow Aussie here. Cairns, Nth QLD.
I've been watching this topic but haven't waded in because you've been getting an amazing amount of input from others.
I just thought I'd chime in and direct you to the Emergency stop switch that I use on my home made router.
https://www.jaycar.com.au/latching-emergency-stop-switch/p/SP0786It can be set up as NC or NO contacts.
Not sure if anyone has mentioned this before, but I'd also fit a 0.1Uf capacitor across each of your limit and emergency switches.
This solved an electrical noise issue that I and some others have had with our set ups.
https://www.machsupport.com/forum/index.php?topic=26182.0These guys might be of help to you.
https://core-electronics.com.au/search/?q=0.1uf