We're not on the same page here.
L 2026 was equipped with a early production windscreen and armour plating over the fuselage fuel tank. In this configuration it was tested at a flying weight of 6316 lb.
In addition to this, the aircraft was ballasted an extra 434 lb in accordance with an Air Ministry letter, to be tested at overload condition of 6750 lb.
So, no - armoured glass was not fitted on the aircraft. Some sort of fuel tank protection was, but this has nothing to do with the extra 434 lb, as it already was installed.
Question - why do you think 434 lb is meant to simulate armour upgrades? Is that an assumption or do you have more background information?
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