Dynamic creation of list partitions in highly concurrent write environment

We are attempting to evaluate list partitioning over hash partitioning (which we currently use) to better facilitate dropping tables that distinctly model devices we wish to purge. We don't want to use a DML statement for cleanup since these tables can contain billions of rows otherwise. Using PG15, we've hit a snag;

We're attempting to use declarative partitioning syntax in a function run as an after trigger; we hit deadlocks. We try the older inheritance alternative, we still hit deadlocks. I appreciate this is generally because creating tables isn't a concurrently supported operation. Here's the general approach we have, without code and with hypothetical model, since I'm writing this hastily;

table devices; <-- After trigger on here

table routes; <-- To create physical partition for this logical table

table route_for_device_N; <-- The dynamically created partition
--