Hey DLV,
Congrats on your new machine. What size tire and what mower did you buy?
I have not seen any type of leaf blower for the BCS. The sweeper does a very good job of cleaning up lawn. It's aggressive enough to throw the gravel back onto the road after a winter of plowing. It's also very good at dethatching the lawn and cleaning up other debris. I'd lean towards buying a Caravaggi sweeper versus the BCS sweeper. There's a fellow in Red Wing, MN that has a fleet of 8 BCS sweepers on 853s. He goes through a shaft and knuckle a year on his BCS sweepers. I bought the 852 I mowed hay with last summer from him. He also has a BCS 730 with a Caravaggi sweeper and just replaced the knuckle and shaft this year for the first time in 8 years. His machines are run by hired hands in Minneapolis/St Paul, so they get 10 years of abuse in one season.
If you're creative and can fab stuff up, you could find a purpose built blower with a blown engine on CL, buy an adapter and build your own...