Of course, you can buy a bike or accessories costing above the €1250 plateau (or €3000 for ecargo bikes) fixed by the scheme. If you decide on a higher-priced bike, you will have to pay for the balance yourself.
For example, you can purchase a bike costing €2000 through the scheme. You will have to pay €500 directly, and the €1500 remaining will be paid through the scheme as a salary sacrifice. The same goes for electric bikes and cargo/ecargo bikes plateaux.