Also, do it assuming different linguistic backgrounds. It could sound dramatically different by people that speak English but as second language, which are going to be a whole lot of your users, even if the application is in English.
I'm a native speaker of English, northern California dialect. I pronounce every one of those letters, to varying degrees. Some just affect the mouth shape by subtle amounts, but it is there.
Just FYI, I would read it out loud in English as “wander fuggle”. I would assume most Americans would pronounce the ‘g’.
I thought ‘wanderfugl’ was a throwback to ~15 years ago when it was fashionable to use a word but leave out vowels for no reason, like Flickr/
/Tumblr/Scribd/Blendr.