No, the Doc Blue (which is made by Stan's Notube) isn't meant for tube.
There are some products made for tubes but their effectiveness is very limited, much more limited than the sealant in TL tires.
On some bikes its possible to slightly move the mudguards to increase the clearance.
Is performances isn't your main goal, the Big Ben Plus is the best choice.
There was also a Big Apple Plus, also 55x406, but slightly thinner than the Big Ben Plus. You can maybe find some NOS of these tires ?