Hearts fan here. Would be a good move for him, not too far away from Newcastle, with 3 Aussie team mates and will play in a far more physically intense league than the championship or the A league.
Also will play in bigger games than any in the championship, Hearts Vs Hibs, Hearts Vs Celtic and Hearts Vs Rangers. Has a realistic chance of getting to Hampden at least once too.
A loan till the end of the season would be sensible, perhaps with an option to extend for another 12 months seeing as it’s a very high chance we’ll have European group stage football.
P.S having looked through their squad, Hearts would absolutely hammer Middlesbrough.