I don't think you can hire an accountant for even $2.6k basic, let alone $2.6k inclusive of CPF and medical benefits.
Her junior accountant (filipino girl on WP) gust got promotion and her salary went up from $2500 to $3500 after working two years on that position. Yes, you can hire but with $3500 you will get better candidates.
But back to the topic - $2600/mo is >$30K expenses per year without clear benefits. As I said, any reasonable CFO/Controller won't accept these charges.
Secondly where you will have serious problem for accounting/accountability/audit standpoint with this approach is using personal card/cards for business transactions. I do not know what local business culture looks like for SME but my wife's company is small startup (about 40 peoples worldwide) whole owned by an MNC while having complete operational independency. Despite that they have to comply with all audit/accounting requirements and not using personal cards for business transactions is very big red flag.