Introduce parliamentary accountability by allowing both Houses of Parliament to be able to fully debate monarchy, ask direct questions, and actively scrutinize public expenditure on the royal family.
The power is already with Parliament; the MPs just need to decide to use it
the current bloated sovereign grant, that’s linked to crown estate should be abolished and replaced with a new, much simpler and more transparent "Royal Duties Grant" voted upon annually by MPs.
No problem with that in principle. There would need to be decisions on where the money came from if it was decoupled from The Crown Estate. There would need to be decisions about what other bills did not receive Parliamentary time to allow yearly discussion of this one. The recent SG Bill (Act next month) has fixed one of the 2011 anomalies.
the royal duchies should be nationalised by having them subsumed in to the crown estate, explicitly establishing them as public property belonging to the British taxpayer.
They are private, not public property. They are private estates since the 1300s, and were handed back to the monarchy for the personal property of the monarch/heir after the interregnum.
Under current UK/international law if they were seized by the state appropriate compensation would have to be paid.
the legal exemptions that shield the royal family from FOI requests should be stripped away, subjecting them to the same public transparency rules as any other public institution.
My understanding (from the last time I read a legal argument on this) is that members of the RF have the same rights under FOI as any other individual in the UK. You may have heard differently.
create a strict, transparent registry detailing all royal gifts, similar to that which MPs have, alongside a formal register to hold non-working or extended royals accountable to Parliament for their commercial activities.
There are already rules regarding gifts. Would agree to transparent registers for working royals, MPs and members of HoL.
I don't think non-working royals should have any more scrutiny than any other private individual, as long as they are not receiving any tax-payer funded benefits. (I exempt security, as that is based on risk.)