Cool! I think this seems like a really straightforward idea. From what I understand however they would like to raise crypto funds on giveth for Land Holders (NFT purchasers?) for their own personal campaign? What would the land holders use their funds for?
If Land Holders can prove their campaigns support public goods or an impact cause such as social or environmental issues they could be approved for verified status, meaning their donors would get GIVbacks. If however, the connection is unclear or they are collecting funds for their own personal benefits they could make a project on the platform but their donors would not receive any GIVbacks.
Maybe there’s something I missed in your proposal but the ideal fit for Giveth are projects working in those areas of public goods or impact.
You might also want to take a look at similar NFT proposals Giveth already has on its plate for inspiration: