Just so I know, Is there a difference between these inline hi-z/low-z adapters vs. a DI box other than form factor and the added bells and whistles on the DI like ground lift and PAD?
The RS adapters are cheaper and smaller and do one thing, which is the one thing you're asking it to do. If you didn't already own DIs, and if this were its only intended application, then I'd say just get the adapter. A passive DI costs more, but can also function as... a passive DI. Until I came here, I didn't know you could use them in reverse either.