No a better way forward has to be new, to the right spec but with a cost-effective procurment process .....mmm tricky!!
Back in the days when MoD trained people to "do" airworthiness, one of the basic rules of thumb was "Never modify a modification". It wasn't a hard and fast rule; more designed to make you stop and think before giving approval to proceed with developing the mod in the first place. Good advice.