Funny, I was just thinking the Barcid kingdom could be a magnificent piece of plausible deniability! OTL did not the Barcids expand Iberian holdings on behalf of Carthage in this time frame, and did they not in the end render more service to their queen city? Hannibal et al are doing exactly what they did OTL and I believe OTL too there there was some bad blood between them and those who dominated the mother city, and the Barcids were pretty close to being exiles too.
Carthage has had some harsh peace terms imposed on it. The question of whether or not these treaty points apply at all to some rouge operation that ostensibly denies its allegiance to Carthage is a vexed one! Will the Massaliotes show up at Hannibal's ports in Iberia or North Africa and demand the share of the tribute that his territories, of the remnant allotted to Carthage by the treaty, would provide a fair share out of? What about the fact that now all of a sudden it is not Carthage but the Baracids who control the Gate of Hercules? Can't all the Punic ships currently operating in Atlantic waters suddenly claim to be Barcid rather than Carthaginian, therefore immune to the stipulation they must withdraw in favor of Massaliote traders. As I've suggested before, I rather think most of the northern trader peoples would prefer to stick with the devil they know.
Massalia can present demands and ultimata all she wants to, but down in the south of Iberia, either they put up, with an expedition of sufficient magnitude to annex Iberia, or shut up if they can't raise such an army.
Will Ptolemy send any contingents of his soldiers west just to honor the alliance on a point or three that don't concern them directly in any way? Alexander of Epirus might at that, just for practice and glory if not out of love for his allies. But almost certainly, it is Massalia and her minion cities that must do most of the work of either conquering all of Punic Iberia or bringing the Baracides to heel.