Sounds close to the position here in the UK, except for the IFR requirement .
I.E mode S required for new fit, but can replace existing Mode C with same.
ADSB Is bugger all use here as far as ATC goes (Trials are ongoing and I believe a very small number of ATC units actually have recievers on trial)
Only Reason I have ADSB out set up is for other aircraft with a suitable reciever to see me, which similarly seems to be the only gain Skippy would see.
I use a seperate ADSB reciever, but you could of course just buy a SkyEcho with in/out, though that would not cover the IFR ADSB requirement you have which would need fully certified install....dunno if Skippy flys IFR