Yes, it is possible that CY4532 works as a sink with changing Sink PDO. No HW modification is required for CY4532.
・Regarding the FW:
Although you can use "CYPD3171-24LQXQ_pb_3_1_2_1511_0_0_0_pb.cyacd" FW, it is not latest version.
As of Jan 2020, CCGx Power SDK latest version is SDK 3.4 and latest FW for CYPD3171 Power Bank design is "CYPD3171-24LQXQ_pb_3_4_0_2274_0_0_0_pb". We always recommend the customer to use latest one.
This is what I explained earlier to you in Japanese. About EZ-PD Analyzer Utility log for CY4532(CCG3PA)
・Regarding the points to achieve 100W sink:
Please check if the Power Source can supply 100W (20V/5A). Also, please check the Type-C cable has EMCA as well.
・For your information:
I will attach configuration settings in order to achieve 20V/5A contract. Also, log is included in the zip file.
My tested environment is that: [CY4531 (CCG3) Power Source] --[EMCA Type-C cable] -- [CY4532 (CCG3PA) Power sink]
CY4532_20V5Asink.zip 8.1 K