If I understand correctly, you want to post the GR once you have the invoice and ready for posting it. So practically the GR is not so relevant as it looks like you are ready to pay the invoice and just a need a GR to complete the process. If this is the case then why don't use two-way invoice matching process.
All you need to do is to remove the GR-based IV flag in the PO, which will then allow you execute MIRO without MIGO.
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