This was achieved by soldering another 22R resistor in parallel with the one already installed. Quick hook up to a 12V battery confirmed the new current at 114mA, which is good enough.
the only concern I have now is that the LM317 is now dissipating approx. 0.775W (after a full charge) rather than the 0.35W-ish previously, but I'm confident it can manage.
Thanks, and hope to see you soon.
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