King Cajones, Spoons! I doff my hat to your tenacity.
If not, sadly, to your Maser, which sounds like a wrong 'un.
@dickygrace will have an expert view on how much you need to spend for a right 'un, but I'm sure they're out there. As someone else mentioned, you're not far off a 4.7 if you can dig a bit deeper. What it'll cost you to sort yours out will cover it, would be my guess.
Nowt wrong with buying unseen, I'm with you on that. I bought my Vantage blind. Needed a couple of bits but otherwise was mint. Mrs Crud would still rather I'd kept the Granturismo, though!