Steve House
Veteran
Cipo, sorry to get into this again, but the more I follow the thread the more I think you need something like the AKG micropen. You can use it as a lav and also as a handheld mic. I think that if your main interest is recording interviews it´ll cover most of the uses you look for at an affodable price.
http://www.guitarampkeyboard.com/photo.php?id=3891
That is a mic with a wireless transmitter - good approach but it also needs a receiver and I don't see a battery powered mate to it preently offered by AKG. They used to have the PR40 receiver but according to the AKG site both the MP40 and the PR40 have been discontinued.