I think ACME makes a sdhc- shoe horn to help you cram those games on there. Or I think they sold a sdhc card stretcher but it was only available on their website. While it doesn't actually stretch the sdhc card, it works by physically painting the inside of the sdhc card white and the outside of the card dark colors. This illusion is enough to trick the iso into thinking that it is actually bigger than it really is inside the card.
Just make sure you use a sdhc stretcher and not a regular sd stretcher as the stretcher for the regular sd cards uses a latex-based paint and the sdhc is prone to latex allergies.