Wow, what a great idea! I'm originally from Bulgaria and I've enjoyed this kind of "universal understanding" to some level with almost all nearby Slavic countries (e.g. Macedonia, Serbia, Ukraine).

I really like the approach of Slovio, it was instantly clear and understandable. I think with some practice it won't be a challenge to adopt it in writing (e.g. plurals with "-s" for some words is a bit strange at first).