we had a similar situation last season in a friendly. The oppo batted first on a good deck and the aussie overseas batted/crawled his way to 100 in about 32/33 overs. We stuck on our worst 3 non-cricketers to bowl and thought he would take a hint...he didn't and racked up 170 something not out. Made my blood boil as when he got a 100 they were only 2 down with 7/8 overs to go and they never once considered giving the other guys a bat. Mood wasn't helped when chasing 320 in 40 overs, they put 4 guys on the boundary after 3 overs. Simmy still scored 50 in 6 overs lol, but we were bowled out for 220 in 30 overs.
They've promised no overseas this season and it's a nice spot so all good in the end.