Another thing to remember is that radical changes in TSP are more likely to screw up.
I've used quick R commands followed by a K or a brand new table to get some good Noise bursts. I use a lot of table switches inside tables. If I want to switch back to the original note of something ill just put a table switch at 03, 06 etc and go from there.
You'll be able to get good Noise sounds from a gameboy without much more fuss, don't worry. In my experience an emulator tends to produce louder more industrial style sounds while a gameboy has more well rounded noise.
Once I switched to a gameboy I never went back, never even thought to go back and it's been three years. Sure an emulator definitely sounds different, but you really get the full potential of LSDJ from an actual gameboy. Trust me you're expectations of what its like to write using the gameboy will be fully realized. You'll be clumsy at first using the buttons though since you're used to the keyboard. You can be sure of that haha.