Thanks Rodney,yes 90+% of my riding is on the street and want to quiet the front tire noise down,Dale.I haven't used that combo on the TW, but I have run mismatched tire combos in the past on other bikes. I'm assuming street riding is your main objective. The stock rear tire on the TW is good enough on the street that you'll be fine in that regard. I would replace the rear tire with a tw204, but not until the stock one is worn out.
Do not run the TW34 on the back and a TW203 or similar on the front offroad unless you like doing faceplants. On the street, not a problem, as the 203 is plenty grippy enough to prevent the front end from washing out. in the dirt, really bad idea.