I mean No-one is forcing you to not use a transpiler right? If it was quicker to use one or build a specific, limited one for your existing codebase and run it then you would certainly have done that already.
Sadly none is available for my current use case. Building one is so far out of scope that it'd be the most epic yak shaving of all time. If this was a personal project I would consider it. My personal projects are all about the journey and not the destination so side quests are all part of the fun. Not true for my day job however...