Is it OK to start my car just to let it idle a bit?

No! That is the worst thing you can do. If you are going to run the car, take it out for a good 30 minutes at least.

When you start the car in cold weather, the moisture in the engine will condense to water. If you don't run the engine long enough to void the water, it will mix with the oil and form sludge. The heated garage might make a difference if it is warm enough, but I wouldn't do it, at least not on a regular basis.

 

It is better to just connect your battery tender and leave off until you can drive to get oil up in temp to get rid of any moisture.... depending temperature and driving habits ..that could be 7 to 20 miles

Leaving it on a battery tender for the next 3 4 months without starting is your best bet if you are going for a nice drive

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What they said. Spot on advice.
I know a lot of posts say "Ferrari's don't like to sit for long periods of time".
Due to some health problems, and a move, my '99 360 sat for 6 months without being started in 2019. It was on a battery tender and fired right up after the 6 month rest. No problems.
15 years ago I had a 348 while living and working in south america. The car sat at my place in California for 6 months at a time, being driven every six months when we were home for a break. Other than the usual 348 gremlins, the idle time of six months didn't seem to matter. Did this for 5 years.
Drive it or don't start it.

 

Some of my cars were literally used in this manner for decades when I live in Minnesota full time. When you include all of "salt season" that's about how long you have to avoid the roads in the winter if you truly want to preserve the vehicle...

 

I visited Boardwalk Ferrari (Plano, TX) a few times in December 2019.

They would start every showroom Ferrari every week and let each idle for 15-20 minutes...no driving...no moving...idling...for 15-20 minutes...

Imagine the dilemma.

 

So that's why the battery dies shortly after purchase.

 

I had to move my 488 out of my winter storage garage while the building was having work done. I was less than happy having to drive it down my salted driveway. Albeit it wasn’t far, but more than anything I don’t like “dry starting” an engine once the car is put up for the year. It will be moved back up tonight and I’ll be damned to start it again until I can actually drive the car.