The underfloor hearing game has moved on a lot recently.
You can get it fitted into 22m chipboard.
https://www.underfloorheating.co.uk/profi-chip
So you just replace your floorboards with it.
You'd need advice about insulating enough underneath without risking rotting floor joists.
Definitely want to keep the existing floor, but the joist fitting version looks like it might be suitable for that
@Hefty started
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The underfloor hearing game has moved on a lot recently.
You can get it fitted into 22m chipboard.
https://www.underfloorheating.co.uk/profi-chip
So you just replace your floorboards with it.
You'd need advice about insulating enough underneath without risking rotting floor joists.