If the cost for the left luggage doesn't draw you back, it could make sense, as you would need to go from Terminal 3 to Terminal 2 by CDGVAL anyway if you fancy catching the Metro/RER to the city. So in this case, upon arrival, find the CDGVAL (an automated train running between the terminals of CDG) towards terminal 2. Exiting the CDGVAL find the elevator at the end of the platform and go up one floor, head straight for maybe 50 meters and baggages du monde should be on the left. For retrieving, you should probably aim for an 8-8.30 am arrival at the airport. Then walk towards terminal 2F for about 10-15 minutes on a footbridge. As you're in business class, you have a dedicated check-in area at 2F, these are the very first check-in desks on the left after the footbridge. Bag-drop deadline for the 10.05 departure should be at 9.30 am. Security entrance (marked Acces No1) is also right next to the business-class check-in.
However, IMO taking a taxi from T3 to the city and then back to T2 with your heavy bags might still be cheaper and more convenient, as you might buy some stuff which you might wanna put in these bags… or have some things in these bags you might find useful during your stay.