You say the contract is good for one year. Does that mean there is a reversion clause in the contract? If there is a one year reversion clause, you have nothing to lose.

It's also a good sign that they're willing to pay for the demo costs. The 50% deal would be fine with me.

As long as they don't ask for money upfront, and as long as there's a reversion clause (and you own 50% of the publishing), I'd say "go for it".

If you can afford one, consult with a music industry attorney (for peace of mind).

Best, John