Mining difficulty will not be low. I think that is your fundamental flaw here.
With 3% hash power it will take forever to mine a block.
You can trade all you want on that chain. You will never receive your "bitcoin".
What? That is nonsense. If the big guys leave the old chain and join the new chain, then the old bitcoin's difficulty will drop to CPU mining levels.
Everyone could just grab their CPU or GPU card and start mining bitcoin again without ASICS.
The old chain would literally be like bitcoin in 2010.
There is of course 2 week period for diffuculty adjustment, so the forkers have 2 week to stabilize their chain. Which I doubt is enough time to do it.
Just watch ETH classic and see yourself, in ETH the difficulty retarget interval is literally 15 seconds.
Eth block time and retarget is completely different?
There is no 2 week difficulty adjustment in Bitcoin. It is ever 2016 blocks mined.
3% hash would take 5 hours to mine 1 block. (at 1mb, fees would be astronomical, mempool full, you would not get in, ever, on average)