That's probably rare enough that you could just make a small SKU for mobile if that ends up being big enough.
If people are going to get hung up over memory capacity then maybe by the time it shows up on desktop 3 or 4 GB chips will be available. If they (revert?) back to a schedule like RDNA 2 then it will be August or September of next year before you will see N33 desktop. If the laptop version sells poorly then maybe you will see it sooner.
The 4 lanes is maybe not an issue with laptops since they will be using PCIe 5 but more ram would be helpful on desktop 4.0 or 3.0 systems I think.
N33 is drop in compatible with N23 so will be 8 lanes.
N33 is going to be a cheap cheap part and with the spec it is perfect for 1080p and will be okay at 1440p. For that 8GB is all that is needed but it will be a 7600 tier part not 7700 tier.
N32 will fill in both x800 and x700 tier simply because that makes sense, 200mm of N5 is not a fat lot and then having the option of using 4 or 3 MCDs. Some of which will be forced if one of the IO links to the MCDs is defective. BOM wise it will be far cheaper than the N21 BOMs and it will be comparable to N22 BOMs.
Another way to look at is is a you can get about 107 N21 dies from a full wafer and 177 N22 dies from a full wafer, some of which will be defective (calculator I used did not include defect rate) for a total of 284 dies across 2 wafers.
With N32 you can have 295 dies from 1 wafer and 1719 MCDs from 1 wafer. That means from 2 wafers you can build 107 N32 based 7800XTs + 177 N32 based 7700XTs + have 11 N32 dies left and 760MCDs left.
Cost wise I believe 2 N7 wafers is a bit more than 1 N5 wafer, not sure if it is more than 1 N5 + 1 N6 wafer, but you are only really using a bit more than half the MCDs off of the N6 with that ratio so really 2 N5 wafers + 1 N6 wafer can probably build all the N32 cards that are required if the skew more towards 7700XTs. That is 3 wafers building nearly 600 GPUs at just under 200 GPUs per wafer which is better than N22 in terms of wafer efficiency and far far better than N21 for x800 series.
Also because 2 of the more popular segments are built using the same GCD it allows AMD much more flexibility it meeting needs depending on what product has more demand vs their forecasts.