Removing Heater Box

Has anyone removed the heater box entirely and replaced it with a simple universal hot rod heater ? I have a factory AC car that I plan on never fixing the AC. Now the heater core is leaking as well. I was thinking something like this just to knock the chill off and defrost the windows.

https://m.summitracing.com/parts/su...wOmMktVAyUaArGk8P8HAQ&ibanner=MobileSwitchYes