Aha- yes trampoline routing would make great sense for this

lightning

Scaling LN routing with Chaumian eCash

> I was also thinking about that pain point, it would likely require an upgraded routing method in order to use one or multiple federations along the route.

What's interesting is the twi proposed alternative routing mechanisms that I know of would solve this pain point:
- [trampoline routing](https://bitcoinops.org/en/topics/trampoline-payments/) by having C be a trampoline node,
- [ant routing](https://arxiv.org/abs/2002.01374), since every node responds based on their knowledge of their surroundings.