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If you can find nrf52 modules where you are then that's a good start, if you're not too scared of DIY intricate soldering then you can use them to build your own NRF micros. Ultimately the controller on these modules is the same as that of a nice!nano and if thus capable of running ZMK alone, there's not really a way as far as I know to pair them with a promicro or blackpill or similar to get a fully wireless solution.
Everything is described in the zmk docs. For more details, you can join the zmk discord. The firmware is also open source https://github.com/nguyen-v/zmk/tree/aloidia-dongle