You have a technical reason that should not result in hurt feelings.
The crucial difference between Mac and Windows layouts is not whether there's a Fn key to the left of Space, but the order of the Option and Command keys. Mac has Command next to Space, while Windows has Alt (= Option).
If you're anything like me, then your muscle memory (after a couple days or weeks of accommodation) won't give a flying fuck of whether the Fn key is missing. In the long run, it will adapt as you switch back and forth between keyboards.
Your muscle memory, however, may punish you hard for reordering Option and Command. So focus on fixing that. Most newer keyboards have a firmware setting or physical switch that rearrange the scan codes.
If yours has no such setting, MacOS has a per-keyboard software setting that allows you to remap those two keys specifically, but I'd advise against using that because it never worked reliably for me. Instead, email the vendor and ask for advice.
Once you got the scan codes reversed, consider switching the keycaps accordingly to make labels match (if they're the same size. Otherwise, ignore the labels.)
YMMV but maybe it helps.
> MacOS has a per-keyboard software setting that allows you to remap those two keys specifically, but I'd advise against using that because it never worked reliably for me.
I've been doing this for 20 or 30 years and it's never been a problem. Works fine. Been using standard PC keyboards with my desktop macs for so long I don't remember when I started.
Good to know! (I assume you’re referring to the macOS-side remapping.)
Sounds like I may have hit some obscure bug that may not bite everyone.
That lie can backfire badly. They may just get you another keyboard for your next birthday.
I use a Keychron Q5 with customizable keycaps. It's connected via bluetooth to both Mac and Windows machines and also only has three keys to the left of the space bar. Personally, I don't think I've ever once used the "Globe"/FN key.