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Yep, both of those are on my list of possibles, with taking out the concrete with a breaker being the favourite of the two so long as it's safe and doesn't bring the house down around me? It's at its tallest near a wall so not sure if the wall would crack and we'd be open plan with the neighbours before long. Seems like something I'd need to get surveyed first?
The more likely possible at the moment is the scribed layering of hardboard over the boards to lessen steepness of the drop. Level isn't crucial to me as much as not a trip hazard and not going to kink whatever I put down (cork planks or vinyl clicky things at this stage).
CYOA-
you'll probably still need to ply over the whole lot once you're done to get a flat enough surface for vinyl tiles, otherwise you'll get gaps where the tiles join.
subfloor prep is really important for a good finish.
I've just done the same in my kitchen, running 8x4 sheets of 6mm ply over old floorboards, concrete, and a new area of floor that's been brought up to the same level as the rest.
bigshape
hmmm... if the boards are level and the concrete is wonky, then making the entire floor level is going to be tricky without either removing the concrete and re-laying it level with the boards, or battening the whole lot out and laying a new chipboard floor over the top. obviously it's going to raise the floor though...
depends how level you want the floor to be.
got any photos?