To answer my own question, LPCS Cascais does have an instrument approach
Just a quick look at Jeppview.
And yes, the SR20 does have a front window, but I have to make my 6 approaches every 6 months, and for me IFR is standard OPS. Have to put my Sandel, two Garmin 430's, the S-tec 55x and the Avidyne MFD to work
S.