Kurfürst
Staff Sergeant
Any long-range German bombers put into service in 1943 would have been used against the Russian industry, it would not have been wasted on mindless U.S attacks or suicidal daylight raids on Great Britain.
Remember now, the Bf 109 did not have the effective range to escort bombers any further north than London so British industry was safe from escorted bombers; those that went up without escort would be met by Spitfire IXs for an uncomfortable ride, which did carry cannon. In the event, Hurricane IIC and IV would be made ready for interception duties with four 20mm.
Just for the record, the variants Bf 109 from August 1940 onwards had plenty of reach to escort the Lutwaffe's bombers anywhere over Britiain's industrial centres.
The droptank-less Emils had a range of 660 km, and that was enough to escort the bombers up to London in practical terms; when the E-7 appeared in August, capable of carrying a droptank, it extended that to 1300 km, ie. well past London. The 109F and later had a range of 1600 km and over with a single droptank.
The F/G/K was actually they were capable of flying from Berlin to Eastern England and back, though that would be really pushing it and without any fighting or high consumption engine regimes, of course.
In a more realistic escort scenario, taking of from near Calais, Leeds or Manchester would within escort range for 109s and 190 by 1942, perhaps a bit further north, too.