How
>do I quickly age the new bits to match the old which are dull/tarnished but
>not covered in verdigris?
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The usual best (ie easiest) is the ammonia and sawdust recipe.A slightly better colour is the copper sulphate and zinc chloride (killed spirits) one. Don't use killed spirits alone, and certainly not with bronze rather than brass. It patinates well enough, but it doesn't stop ! There's a risk of "bronze disease" (galloping regenerating chloride corrosion) which is a bugger of a job to stop, if it has got started.
Watch out for commercial patina solutions - most are deliberately _very_ dark. Always try them first, ideally on a similar composition of alloy.