"In the meantime, I guess I need to start getting used to the quirks of the 'mnemonic' keyboard layout..."
Not necessarily - it depends on how often you need to input Russian. If you need to do it only occasionally, then you may want to choose this method (it is used by people who are at work where IT does not allow the installation of additional keyboard layouts):
- use good old phonetic layout which you used in previous years
- it will cost you 2 additional seconds
That is, you can input with that phonetic layout on Internet page (Virtual Russian Keyboard) - regular input, from keyboard (if your device have one) - though touch-based input also works (by mouse on PC or Mac) - and then just spend 2 seconds to copy your
text from there to the needed place.
You go there and choose _your_ variant of Phonetic layout and this Virtual Russian Keyboard would remember your choice, so 2nd time there will be no need to go to the menu and select your variant:
the Virtual Keyboard is available in Russian and in English (top left corner - link to switch):
http://WinRus.com/keyboard.htm - English UI of the page
http://WinRus.com/klava.htm - Russian UI (probably little bit better designed)
:-)