There are a couple of ways around DX coding. You can:
Alter the code on the film, either with tape/conductive copper tape or with a new sticker.
Leave the film alone and remember to always expose it by the desired value above or below what the meter is telling you.
As I've never felt the need to push film I'm not overly bothered, the price of used P30s at the moment is so low that it's no great hardship to buy a few re-coding stickers if you really want to push or pull.