Using rs485 and pjdl together on the device

[hypnosiss]

Hey,
I am using MySensors on RS485.
I want to use PJON with PJDL transport layer on one of my rs485 node to connect another module over one wire and forward data to mysensors gateway.

It looks like:
MySensors gateway <=rs485=> MySensors node <=pjon=>pjon node

Is it possible? Can I receive packets over rs485 and pjdl transport layer in the same time in arduino mega?
Should I expect blocking rs485 transmission due to bus.receive() and bus.update() in loop?

Best regards
Mariusz