Fitting a 130 mm hub into 126 mm dropouts is fairly straight forward and done frequently. You shouldn't "cold set" (permanantly bend) an aluminum frame but fitting the wider hub by flexing the stays is fine if a bit of a struggle.
When Shimano first introduced 130 mm hubs, they provided locknuts with a beveled edge to make inserting them into the then common 126 mm dropouts easier.
BTW, aluminum flexes a lot easier than steel for the same tube dimensions. However, Al frames tend to have larger stays so they are stiffer.