Think money would be better spent on bolts for rebolting rather than twist-shackle anchors. Twist-shackle bolts are not cheap and no ring-bolt anchors need to be replaced from wear for as far as I know.
People should be TR’ing through their own draws anyway, not the anchors.
I like your idea though, get people to nominate a route they’d like to see rebolted and get them to donate towards it.
What do you think?