Mick
If you can find the space and weight capacity, I would still go fo a small live well with 'water pump' system. Reason being that aerators ALWAYS heat up the water quickly as the air is compressed. The oxygen budget is lost quickly as the water warms up, as the warmer the water, the less oxygen it carries. In this regard, a small raw water pump will be far more effective overall.
Just my 2p
Trev