Why the XLR version of the mic with internal battery? Are you planning on using it with XLR inputs that don't provide phantom power?
Using a mic with a big XLR connector and then an XLR to mini adapter cable for a wireless transmitter just seems horribly fiddly and unnecessarily bulky. Not a very good plan, IMHO.
Yeah, you could use all that to get a dual-application mic, but my choice was to just get a Rode lav mic which has user-interchangeable connectors. You can get one for your wireless transmitter and an XLR for wired use. The Rode also has user-replaceable cables and is fully interchangeable with the headset version as well. It is a great combination of features, IMHO.
The Lectrosonics (note spelling) website should have complete information on which transmitters are compatible with which receivers. If you can't figure it out from there, you can call them. They are very nice people. You did not complete your profile so we don't know where you are. Note that not all frequency ranges ("blocks") are legal in all places. And some places like Europe have power restrictions as well.
That receiver appears to work only for cameras with receiver slots. It does not have conventional outputs that you could connect to a mixer. Not clear how you could connect it to the SD 302. Do you have one of the cameras on Lectrosonic's list of compatible cameras? The receiver is dual-channel and it will feed both channels of your camcorder if it is on the compatible list. Else that receiver will be useless without some sort of adapter arrangement.
Input impedance wouldn't make my top 10 list of things to even think about when buying a wireless kit. Why is it even an issue?