Have to disagree with you on that. Its like saying that it could dogfight with an 215 kg bomb.
Its not a good analogue. Fighting with gondolas does not have nearly same effect fighting with 215 (250kg) bomb.
The weight addition may same, but result drag from a 250 kg bomb is far more than gondolas - some 40 km/h as I know compared to 8.
It is the extra drag that reduces turn ability, climb etc not the extra weight (extra weight only very slightly adds drag due to increased incidence needed).
So a gondola with very little extra dreg reduces climb, turn etc. very little, a similiar weight bomb in comparison is very serious reduction.
There are detailed figures for 109 G at kurfurst seite. Kurfürst - Leistungzusammenstellung Me 109 G.
In fact its worse as the weight is out on the wings well away form the COG.
That does not make sense to me. How is the same weight of two wing MG 151 worse in 109G than in G-55? Or any other fighter with wing gun, say 190, Spitfire, P-47 etc? You have to explain.