Not at all. People swap liners all the time. Aftermarket liners have so many positive attributes to them that bootmakers are starting to use them in their boots as the "stock liner" most commonly seen with Intuition liners being used with Full Tilt, Dalbello, and Scarpa boots. People take Intuition liners and swap them into their Radiums, and their Black Diamond boots quite frequently, they are higher performing, better molding, and warmer than the stock liners. It is a great idea that many already implement...Go for it!