screw in front tire

[LongRanger_imp]

If you ask ten people, you'll probably get eleven opinions. Me? If the tire continues to hold air, I'd keep riding it and make plans to replace both tires with a matched set when they're due. I imagine a BT54 front would work fine with your Dunlop rear, but then you'd have two different tires at two different stages of wear. That wouldn't be my preference if it was my bike.