Initially if you are proving the concept for your business, the BMFA offer an insurance which may be relevant:
https://bmfa.org/Insurance/Data-Deve...tion-Insurance
With regard to the qualification, you wouldn't expect to fly a hot air balloon on a PPL A, so why would an air vehicle which is operated from the ground, is flown much closer to third parties and structures than a light aeroplane, and probably needs to have an autonomous 'return home' program uploaded to it, be appropriate to a PPL A? Sure there will certainly be areas in which the syllabus is similar, but there is a heck of a lot which won't be.