Both crank arms are shared between 1x and 2x (product number FC-RX600), so you could convert it to 2x if you can find the rings. Bit costly though.
THAT is a really good shout, I could convert the one I already have..
Edit: impossible to find
@giofox started
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Both crank arms are shared between 1x and 2x (product number FC-RX600), so you could convert it to 2x if you can find the rings. Bit costly though.