An experienced local locksmith / key cutting place can cut and program (clone) a transponder key for the DL650. Get your spare cloned and then use that one and keep your OG.
If you take both keys with you, they can clone the code off the (existing, damaged key), and copy the bitting off the pristine spare key. Mine cost £40 and after they got the key blank, it was done within 20 mins.
(The only idea behind cloning the bad key is that then you have two unique keys, rather than two keys that have the same code... not that I believe they can erase a transponder code from the ECU anyway, even with Suzuki tools)