Bearing in mind the age of the church I'd strongly suspect the statement about there being few if any burials in one part of the churchyard, I'd bet that if surveyed by Archaeological ground penetrating radar and other methods it would be found to be loaded with burials from perhaps pre parish records times. Many graves were buried over as time went by due to the demands for spaces.
It's a shame the local community can't buy the church to use for community purposes so that it remains the centre of focus for the place, it has happened elsewhere but perhaps the local community aren't that bothered.
I noticed that parts of the exterior has previously been rendered, most of which has fallen off, that would indicate a maintenance liability to both remove the inappropriate rendering, probably sand/cement, on the lime mortared stonework, That will be costly plus the copper roofing will need periodic and expensive maintenance - that's if it hasn't been nicked by the metal thieves that look for such.
It would certainly be an interesting project to convert to housing use, I suspect that due to its listing few if any additional windows would be allowed so quite an inward looking home. I have seen conversions of such places on a number of TV programmes with varying success, the respect for the building and its former use will be a tricky balancing act.
Access to the graves will be a problem, no privacy if a home plus the rights of the buried will more than somewhat restrict the churchyard's useage.