The passage you posted speaks of the Bema Seat of Christ IN HEAVEN, not in some imagined ‘purgatory’ where additional cleansing supposedly takes place, as if The Blood of Christ was not sufficient to cleanse us from ALL UNRIGHTEOUSNESS. You have selected the passage which refutes your power structure associated to the little placard indulgence supposedly issue from Mary.
This part seems to indicate that something difficult happens: but he himself shall be saved; yet so as by fire.
Nothing unclean shall enter the gates of Heaven: can I say I will die without having committed some small act which dirties my soul, or is an act of “straw” rather than an act of “gold”? This passage indicates that these problematic acts will be removed as impurities are removed from gold, by fire.
And the necessity for Purgatory will most certainly be the result of Christ’s judgement.