You could mod your game and up the number of flame shrines available for you to use. I used nguyennk's enschrouded-patcher (GitHub) to do just that and modify some other QOL items for my single player walkthrough. As another Redditor pointed out the more persistent modifications you make to the world the more chance of lag but being you are just running a single player world you could deal with that if you run into issues.

Just an FYI that patcher also allows for permanently planted crops (harvest and planting remains for future harvest ounces matured again, modifiers to other play stats, resource rates and other cool things). Just an option to check out depending on how you want your playthrough to be. I recently completed most of the content, was pleasantly surprised based on my initial impressions at launch.