In our case I think at some point we would like to switch to babel, and I did not know that this is something not present in babel. I copied the answer of Ilario to my notes, but keeping it simple: can I have more simple information to track this issue (which I hope includes all the relevant details), and then I will subscribe to that issue.
In Barcelona we are running bmx6 since years. A subnetwork of it we are running a pure bmx6 network based on openwrt, and it is a little bit unstable (daemon crashes), but works fine. I hope soon we can go for the latest bmx6 version in the whole network (migrations are painful), because recently we discovered that openwrt packages was using an old and memleaked version of bmx6 (!!) https://github.com/openwrt-routing/packages/issues/573