Thanks, Migoya. Instant magic pastry method worked!
There is a vague eggy taste, may be due to the stray egg whites.
Compared to the PC at Glacé, this is a lot looser. Anyway, I made a mistake. I forgot to add the sugar to the milk, added after the hot milk had been whisked in and mixture coagulated. The mixture became more liquid after the sugar was added. I wonder if it would have made much more difference.
Combine B and sieve to remove lumps. Heat A to rolling boil. Dump into B all at once, whisking constantly. Add C when cool.
Note: Found updated recipe.