Upvote:0
The consulates usually ask for flight bookings when they are not sure about the intent of travel. Now that they have asked for it, you cannot and should not try to negotiate with them. You have two options as I see it:
The main hurdle here is finding a travel agent who will be willing to this for you. You should be able to assure them that you will eventually book tickets through them. I usually use the same agent for all my travels, so they are quite accommodating towards such requests when possible.
Upvote:1
In principle, the rules are the same for all three countries. Formally, presenting a confirmed ticket is not a requirement but you do need to justify the purpose of your stay and show that you intend to leave the area at the end of the trip. Plane tickets are but one type of βsupporting documentationβ that can be submitted to this end. It would be more-or-less the same for the French or Swiss consulate (I do know for a fact that French consulates do require a lot of details and documentation β at least in some countries).
In any case, your Italian visa would also be valid in France and Switzerland so the Italian consulate is basically issuing it on behalf of these and other countries in the Schengen area. That's why they want to know you will return to the UK and not merely leave Italy.