However, you could do so under the hood, if you have a safety pilot who is qualified and current on type, in VMC, who has a nice clear view out of the windscreen
Or if your RHS person holds an IR and you're in IMC....
It would be very un-wise to practice instruments using screens or hoods and NOT to have a competent safety pilot (rather than just an 'observer').
[luckily the CAA officials weren't there when I shot the ILS, in IMC, into LFAT
]
Cherio
EA