I've not read the full history of this enquiry so may be going over old ground. I recently acquired a 1900 Singapore & Straits Directory. C.A. McIntyre was Partner, Stewart &
Mcintyre, Penang, with F. Stewart. They were Land & Commission Agents & Appraisers. In the Ladies Directory there is a Mrs C. McIntyre and Miss McIntyres living in Larut Rd, Penang. A few other Penang & Province Wellesley
McIntyres are in the Directory. You might find a few details of C.A. McIntyre by using the online Straits Times archive index.