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No such top exists that is packable or light.
I have a roubaix fleece jersey that I cut the long arms to short arms for this type of weather.
A gabba works okay, but isn't so breathable. I don't really rate it.
Could try something like; https://www.sigmasport.co.uk/item/Assos/IJ-tiburu-4-Long-Sleeve-Jersey/YCW
https://www.sigmasport.co.uk/item/Assos/iJ-haBu5-Jacket/36H
https://www.rapha.cc/gb/en/shop/classic-winter-jacket/product/SJK08XX
https://www.rapha.cc/gb/en/shop/pro-team-softshell-jacket/product/PST02XXBLK
On a different subject, I rode on the weekend with an undershirt, jersey, winter/windproof gilet, armwarmers, rain jacket.
The gilet is annoying me as it's a bit short, grabs my jersey pocket contents and drags them up my back and it's bulky so doesn't pack well. Also, my shoulders get noticeably colder than the rest of my body (feet were totally fucking numb but that's another issue I need to sort)
So, what can I replace the gilet with? I was thinking some kind of long-sleeve winter jersey that would go over my summer jersey, warm my arms and still fit under my rain jacket.
But what to go for?