Also, is 4.4kg considered a heavy guitar? Or just somewhere in the middle?
That's what I would consider on the heavy side for a strat-style guitar. That's very nearly 10 pounds in the old language. (9 lbs - 11 oz)

It's not unheard of, but I find strats usually in around the 8 lb mark (3.6kg). Interesting you bring this up, as I just bought a hanging digital scale last week just for weighing guitars. The average weight (ST & TL type) of my guitars arein the 3.6-3.7kg range.

Your FR would likely contribute some extra weight than a G&L 2-point vibrato, but I couldn't say how much.

The 10 lb neighbourhood is where I'd expect older non-weight relieved LP's to come in. I once owned a '69 LP that came in at 13 lbs! (5.9kg) I don't miss it.

Sorry for jumping in & out of imperial/metric... old habits and all...