At the risk of it being a silly question, do you get a 'glideslope' representation on your HSI with these baro-VNAV approaches?
Not a silly question. If the aircraft is Baro VNAV capable (PBN S2), then it will have a glide path indication of sorts.
In Collins Proline 21 aircraft, the initial descent to the start of the approach is flown on VNAV PATH, and when the approach mode is armed and the aircraft descends through the capture altitude of the approach, the vertical mode will change from VPTH to VGP (vertical glide path or similar, can't remember the name). The glide path will continue to be indicated on the PFD in the normal manner, such as an ILS. Once the approach altitude has been captured (VPTH becomes VGP), the altitude alerter may be set to the missed approach altitude without disconnecting the vertical mode, much the same as flying an ILS approach once the GS is captured. The consequence of this is that the autopilot will fly straight through the minima if not disconnected. Again, the same as an ILS approach.