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proceedable
Management speak thread, but otherwise I agree.
Don't bother formally offering on anything until you have a buyer on your house, you're in no position to negotiate until you do.
But it wouldn't hurt to tell the agent you're potentially keen and will probably make an offer once you've sold but that it will be well under the price. They'll then be warmed up to the idea and can warm the owner up too. The agent could well agree with your valuation and might use the feedback to prove it to the seller.
Then once you do have a buyer email the offer with the justification you've used above, the agent can then forward it on verbatim.
Until you are on the market and under offer you are not proceedable so at the moment your offer isn't going to be attractive to the vendor.