great - that sounds fantastic - good for you and for them
about the "new stuff", I think the key is patience, patience, patience on our part
Guineas are indeed super-suspicious of anything new - yesterday I put a waterer outside and to level it on the ground I put a brick under it - oh, they were interested in that! long stretched necks and special sounds to alert everyone that they had seen "that thing" there and were first to alert the flock - real proud of themselves
I just left them alone and now they are drinking from it
since you have a new "thing", not just a new way to prop it up, it will take longer, and I would provide both water options for a while, maybe the old one in a comfortable place and another old one together with a new one in the same place, so they can check it out and get the idea - something like that
if the new thing does not hurt them and they can convince themselves at their own pace of that, they will eventually check it out and if it is water, hopefully drink it