Entering special characters the same way on Windows and Linux

ctrlshiftu followed by the hex value of a Unicode character enters that character. For example, ctrlshiftu41 enters 'A', whose value is 0x41 in hex and 65 in decimal. There's also the compose key, which lets you enter digraphs (e.g. *compose key*e^ produces 'ê'). Unfortunately, neither of these works similarly to alt codes in Windows (where alt65 produces 'A'). As a result, it's challenging to develop muscle memory. Is there a solution to this?