Maybe the ultimate solution is to do as microsoft and generate Scala source code to make interop really convenient:
(note the cute mascot)
But I guess we should evaluate all options in terms of benefits and use cases. The engineers at microsoft said in the presention that it took at least one person (with a backing team, unclear how much time they devoted) the lead time of as much as one year to accomplish this.
But compiling to Python (or some similar tight interop on Scala Native+JVM) may also attract those who gradually want to migrate off Python to Scala but cannot do the migration in big one step (even when assuming all corresponding missing scalalibs or Panama+Babylon were ready to go…)