In reply to Dorsetscrambler:
Portland, fallen slabs, battleship block, the rear section of the cuttings the balcony I think it's called, areas around the quarried blocks at the top of the crags like sharbutts and neddyfields and theres a few other places to offer some suggestions. Just be cautious that the cliff top ecosystem is genuinely unique and should be respected.
Also areas with lines close to each other will offer many bolts where you are not reliant on just one for a belay.
Dancing ledge near the Mexican wave area has top rope bolts reachable from the top, you could use some trad gear nearby to make it realistic. There are quite good ledges at some of the other quarries around swanage but they can be fragile at the top.
If you lead, then belay your second to the anchors. When you ab back, maybe ab off two strands of rope rather than simply lowering. Not only is this realistic to descending a multi pitch route, but it'll save wear on the lower offs as no loaded rope will run through the anchors.
Of course once you feel proficient, the swanage cliffs have lots of possible trad multi pitches to have a blast on.
Beside that, check, double check and check again.