Gaunle,
You can still do insert to get "u" and "oo" as in "k+u" and "k+oo" :)
I know/knew how it works, but having hard time replicating the real process today. The real process is:
the key single and double quotes (' and ") are for (u) and (oo). You know, for double quote you need to press Shift+double_quote.
WAIT. This works perfectly fine in WirdPad - but doesn't always work in MSWord! I can't recall, but one of the AutoCorrect options or Spell+Grammer correction option messes things up. I used to disable auto spell correction to get this, but not getting today.
OK. Suppose you are in Kantipur font area. You type single quote (') after a letter to make (u). Do you see (tarkule, i.e. u) or getting just plain single quote(')?
If you see tarkule, you are on your way.
If you see single quote instead of (u), then click the "undo" button ONCE on the Menu bar. Now, do you see the tarkule?
If it doesn't work, go back to inserting or copy-pasting from the WordPad :(
(For oo, same process)