I don't think you can this via simple inheritance, as Spain was always close to Naples succession-wise than France.
But 1735 points at the wonderful time of the 18th century when a Duke of Lorraine would be moved to Tuscany so a toppled Polish king could take over Lorraine.
When will a Congress of European powers, including GB, simply allow France to take over Naples and Sicily?
Hum, wiki says:
"The Treaty of London, agreed on March 25, 1700 and sometimes known as the Second Partition Treaty, was an attempt to restore the Prgamatic Sanction following the death of Duke Joseph Ferdinand of Bavaria, which had undermined the First Partition Treaty.
The Spanish Empire was now divided between the three surviving candidates. By this new treaty Archduke Charles would receive most of Spain, the Spanish Netherlands, Sardinia, and the overseas empire. The Dauphin would acquire Gipuzkoa, as well as the rest of Spain's Italian possessions, on the understanding that Milan would be exchanged for the Duchy of Lorraine, which in turn would be incorporated into France. For Leopold I, however, control of Spain and its colonial empire was less important than Italy, in particular Milan which he regarded as essential for the security of Austria's south-western flank. Although Leopold I and his ministers were willing to accept some sort of partition, they would not agree to a deal that shut the Austrians out of Italy. Leopold I, therefore, opposed the Second Partition Treaty."
The most obvious way would be for Leopold not to oppose this English-French-Dutch agreement, or to somehow have France adhere to this plan and so keeping the goodwill of England-Scotland and the Netherlands, so at the end of a radically different War of the Spanish Succession the French Bourbons get Naples-Sicily.