For the first several years, my team of Erlang devs had zero Erlang experience prior to being hired; they were just smart and flexible developers. I was ahead of the curve because I sort of remembered seeing a Slashdot post about Ericson opening the language way back when.

A lot of people end up using RabbitMQ as their distributed message queue, which is built in Erlang. If you went with that instead of ZeroMQ; and then slowly added more things, there's a reasonable path to writing more Erlang.

I'm not sure if you can really bolt on messaging and reliability features and get the same results; just like bolting on security later, if it's something that you need, it works better if you have it from the beginning.

But certainly, if you're happy with your stack, don't change it.