With the line divisions adjusted in the first verse, and a slight scansion adjustment towards the end, I think that first verse would work quite well:

Merrily, Cheerily, drown all care,
Christmas comes but once a year,
There are ducks and turkeys, geese and greens,
Carriages that go by steam,
Flocking up to every town;
Boil the pudding and knock me down,
How different now are folkses ways,
To what the where in former days,
For our customers they did not dream,
They'd cook the pudding and geese by steam.