Well, sorry to see all these updates might be needed.
Is there still a chance that pixhost.to might come back?
I don't know, but we have this pixhost.to workaround.
I was playing around with a couple of my old uploads, and found a nice trick you can use when you have a multi image set linked in a gallery.
Edit your old post to change the first image code from .org to .to (in 2 places)- then save that and you should see the one thumb.
Click on that thumb to open the full size image, then you can click on the gallery link, where the entire set will have the new image codes all set up.
Go to the forum thumbnail box and click on that (to copy all the codes), then you can paste the whole set at once in the old post
This is another good reason to -
Please remember to click that create gallery box.
Thanks!