The OP is interested in the Lehigh CSB program specifically. This is a very unusual 4-year program, since it is both AACSB-accredited in business and ABET-accredited in CS. Along with the IBE (Integrated Business & Engineering program), it has a reputation for attracting students with significantly higher stats than the school as a whole. So the OP’s stats may not necessarily seem “too good” in the CSB application context.
Another way to avoid this issue would be to apply ED. That is the ultimate “demonstration of interest”. Lehigh now fills more than 50% of the class by ED.
That’s true, but the non-resident cost of attendance at SJSU is going be around $40k, with no financial aid. SCU (which is only about five miles away) would be the higher-ranked school by most metrics, and is likely to be less expensive for a non-resident.