This would be a difficult task.
Keycaps from Cherry keyboards and new custom key caps from Signature Plastics (see 7bits group order thread) are lower than SteelSeries' caps. I still would not call them "low profile" though. They are only 1.5 - 2 mm lower than Steelseries'.
The biggest problem will be getting key caps in the Steelseries' layout: especially the "bigass" key.