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Yes I confirm you can do that, I've done it with a 120+mm axle (cant remember exactly, laybe 127) and specialité ta bsa30 cup
But be careful. Some axle are machined with two 30mm "seat" and the rest of the axle is something like 29mm (to facilitate the insertion of the axle). But the results is that the axle seat positon doesnt match you bb bearing position
By chance i've found a 30mm hollowgram "plain" axle but I dont know where he is from
If it's not clear I can draw something
@Glws @PhilDAS
And how about buying a longer axle? I noted there are different length like 109, 125 etc