The crossover is the answer to all the issues - PADI Rescue, Deep and do a few exercises. We did ours in Belgium (Rochefontaine).
Generally about €300 and a couple of weekends diving.
Conversion Rescue Diver PADI - Niveau 3 FFESSM avec Voyage-Plongée.com
Yep - I did this as well but was already training twice a week as N2 then N3 in a French fed club - just skipped the N2 exam and did the crossover Rescue to N3 in a commercial structure, and also chose to do the RIFAP dive emergency management module. Was more like 600 euros for me though.
We did have a 3 hour written theory exam though (not a multiple choice questionnaire) - I also "guided", ie led an automous group of 3 at 50 m with deco (instructor was on trimix

Definitely worth it for diving in France, and also for the approach to rescue techniques for non CMAS/BSAC divers, very thorough - I'd say in a commercial structure it's not that different from a Padi course (ie you do the exercise a few times then done), but in a club you can train twice a week to build up automatic reflexes, and this training has been useful in quite a few situations.
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