Hi sir, tried this route last May, Matnog to San Isidro. San Isidro is the port of call of Fast cat instead of Allen. As usual, rough road pa rin hanggang Calbayog. But doable by sedan since yun ang gamit ko. Then ferry from Bato to Ubay. once a day lang ang byahe but two ferry naman ang nag se served. And last ferry is Tagbilaran to Argao.
Try mo rin yung Central Nautical Highway. Na try ko rin last 2015. From Pilar, Sorsogon to Masbate. Once a day rin lang ang byahe. Masbate City to Catingan. Then ferry from Cataingan to Bogo. 2 ferry lang po ang kelangan to reach Cebu. Road condition in Masbate is doable by Sedan. HTH.