So, we're actually talking about a tenor guitar or similar?

It makes sense now and Brendan's advice wasn't quite so strange after all! Yes, mandolin chords will do the job.

The baritone ukelele as described above is also guitar like but tuned DGBE while the standard tuning for the tenor guitar is traditionally CGDA. However, as with the tenor banjo, fiddle/mandolin tunings in DGAE are now very common too.

Sorry about the mix up.