Welcome from Waller County. I get the joy of commuting down I-10 too. A few comments on your request...
1.) Roadsters can be moderately expensive to modify the peg / foot controls. Unlike HD there are very few options for this and most that go this route either modify their exiting setup by cutting it off the peg rails and moving forward then re-welding or go with the Triumph Classic setup ($1,000 or so if you can find one).
2.) Almost any windshield setup will require the Triumph front end fixing kit and hardware with the exception of the generic metric type stuff that you would have to purchase and then modify to fit...anywhere from $400 to $2000 depending on how far you want to take it
3.) Saddlebags are fairly cheap and easy. Get yourself a set of EZ brackets and some bags from any one of several vendors (saddleman, viking, etc) and bolt on.
I have a '13 Roadster and a '09 Standard if you ever find yourself out toward the Thirsty Parrot in Monaville give me a shout and I can show you a couple of options