Why does you accountant have an issue with this - sounds like laziness on his/her part to do the reconciliations ? I use my personal cc for exactly the same function - get the invoices made out to the business and then just write a company cheque/transfer exact amount of purchase from company a/c to personal a/c and all is fine and my accountant has never raised it as an issue- he suggested it in first place - rather than getting company cc
If you're talking about an additional credit card, that wouldn't really work, as the statement doesn't discriminate between the purchases made on each card - it all just gets listed as though only a single card was used.