I'll admit it - I giggled at locktiti, too.

I think the wren idea might work. Carolina wrens (I'm assuming that's what it is) will nest just about anywhere!. We had a pair build a nest on some shelves we had in an outside alcove right before we moved from SC to here. We kept hoping the little buggers would fledge by moving day. We talked the movers into packing that stuff last. Our plan worked - the fledged the morning before. Your idea sounds plausible. As long as the initial position of the nestbox is right next to the old nest, it might work. I like the idea of slowly raising the box to the tree. That's brilliant! Wrens typically nest in fairly low places, so check the height first to make sure she'll still accept the final height. Good luck! I can't wait to hear how this turns out.