Seems like there's a good range of choices below the dimensions/weight of the Sureshot Zoom XL. From the Canon archive:
Dimensions & Weight 161 x 150 x 78 mm, 1510 g (with batteries)
In the mid/late 70s and early 80s, there were a good number of cameras in the 500g or less range. I'll make a pitch for a couple of possibilities, starting with the Olympus 35RC, one of my favorites. Just a smidge larger than the Rollei 35, but with a RF and more conventionally positioned shutter and aperture controls. The Canon Canonet QL17 Giii is also one to consider. Main issue now with this category is the mercury battery, but there are workarounds with the Wein cell or an adapter to modern alkaline/silver cells. In addition, these can be used sans battery with Sunny 16 rules.
In SLR-land, the Nikon EM with the 50/1.8 pancake lens might be a contender. On the arcane side, I was always partial to the Konica Autoreflex TC, but those never sold in any particular volume and may be difficult to find, along with lenses in the Konica mount.