wm6 won't come soon to my and your lobby's screen
it requires a LOT of time to be done, special tools, extracted ROM for the operation and so on, (btw the phone isn't very commercial, wide-spread and so on, which is demotivating programmers)
ANYWAY, now on the topic:
you can try the CLEAR STORAGE option
found in accessories, it does almost fully hard-reset the phone, but preserves DAB app (I read somewhere, that hard resetting did remove the app, but I'm not sure now...)
anyway, here's how to do the hard reset:
1. Press and hold soft1 and soft2 keys (i.e. menu keys).
2. Press and hold power button for around 1 to 1.5 seconds. Release power button. Keep holding both soft keys.
3. After a while, black screen should show instructions asking user to press '0' key to reset to factory default.
4. Press '0' within the timeout period (which is very brief).
If instructions don't appear on the screen, repeat steps 1 to 4.
it'll show the boot screen, and afterwards a black background with the typings, quickly press 0 to reset, sit and wait
as usual, backup all contacts, data, apps, stuff like that, and then do the job
p.p. Hard reset info via http://wiki.modaco.com/index.php/HTC_Monet
p.p.2 Greetings from Bulgaria, and sorry for my dumba$$ English :]