Between "Bonkers not to" and "may be wise to"
But my 'bonkers not to' may mean to me the same as 'may be wise to' to you. I think 'bonkers not to' is a fairly mild piece of advice, not meant to convey anything other than it may be a good idea to get a checkride. We all speak differently (may I add that your English is very good for a Frenchman).