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I have no hard data to support this, but most boosters probably use very little current internally. Most of the DC from their power supplies probably ends up DCC current to the railroad.?

A DC ammeter connected into the power supply cable to the booster should give a reasonable approximation of DCC current to the railroad. If you note the current reading to the booster before connecting it to the railroad, you can subtract that internal current mentally, or adjust mechanical zero on some meters to cancel that and get a closer approximation.

I'm surprised a DMM that reads DCC voltage on its AC voltage ranges won't read DCC current on its AC current ranges. I'll have to check mine sometime.

Don W