Yes, that is what would make sense. BRNAV in most probably the form of one GNS430, Mode S XPDR is technically all you need for the purpose, plus the DME/ADF Combo we are so fond of in Europe...
The question however will be what the regulators will prescribe. European rules say, the aircraft has to be IFR equipped AND approved by the authorities before it can fly the normal IFR. Question is, will there be exemptions to that for flights by EIR rated pilots? I guess not, IFR is IFR and that is quite a lot more in Europe.
As it stands any airplane flying IFR needs at least:
- BRNAV device
- 2x COM FM immune (pretty soon with 8.33 enabled )
- 2x NAV of which one with GS
- DME
- ADF
- HSI or other slaved gyro
- 2 axis AP system for single pilot ops.
and the aircraft needs to have "IFR CAT I" written into it's docs.