Alan, Couldn't find much info on you from profile. What bike. What year and all that.
I have a '99 that I've had for just a tad over a year. Have made many modifications to it all done by myself. Never had any thoughts against just diving right in. If someone can design it and have it made... the least I can do is take it apart and fix it like I want it. In fact as I type this... the LT is again naked in the shop with all the Tupperware hanging from bungee cords as I'm working under the Stingray again with a mod or two and just finished installing the Run-N-Lites which make the front and rear blinkers into Running and Flashing lights. A really quick fix for that.
If you will do a search for Jensen 2212 Marine radio, you should come up with lots of pages to look at. My radio along with the XM receiver just up and quit on me during a recent Nova Scotia trip. Couldn't take a little rain I guess
. I almost couldn't take it either on the 8th day of rain, but that was over the 27 days we were on the road. I tried the 'tried and true' method of removing the battery connectors for an overnight rest but I guess water had gotten in pretty deep.
Anyway the Jensen is an easy replacement and it's a marine grade water proof radio too. The head unit will fit directly in the place where the present radio with the buttons goes and the amp unit will fit right in under that where the BMW unit goes. It does take a bit of cutting on the top of the Stingray but it's pretty easy. You would do well to check around as I paid only $189 for the radio on line. I also got the Sirius receiver made to interface with this radio as down here in the south, you can imagine what the radio stations carry. The Jensen has inputs for USB - Just plug in a USB drive with MP3's and it starts to play immediately. Input for the mentioned Sirius and all the info and tuning is done right there on the head unit which is pretty easy to see and use. And of course the AM/FM and it's also got it's own Weather band too. You loose the remote radio unit on the handlebars but you can reach whatever you need over a tank bag with no problem. You also loose your Tape Player which I had with the '99 but you might have had a CD or other things in later years.
Alan that's a good point where updating your profile to indicate which bike and it's year would help in getting you pertinent information. There were changes made every year or so in the earlier years of the LT's life between the radios and it's peripherals.
You also have inputs for another source via RCA plugs. Granted there is quite a 'clump' of cables behind the new radio but overall it's a no brainer as the sound quality is wonderful,
On the handlebar remote control unit... since I didn't have usage of it anymore, I removed it all together. In it's place I made up a mount that would move the J&M CB/Intercom/Weather radio from on top of the handlebar down so that the radio is now inline where the remote unit was. This gives me back my line of sight to the left mirror and to the On Board Computer I mounted in the dash some time ago.
Too bad you are a good ways up the coast, but I'd be glad to help where I can. Sure that others will chime in for advice also. You know I just looked... you're only about 850 miles NE from me, gosh just a days ride up and I don't have Maryland yet.