This is a very Trumpian remark, whilst I too would like other options, I purchased an FTTP service from BT which was delivered exactly as advertised. I could have bought the same service from Zen or others, but the underlying service provided by Openreach would be the same. In both of these cases the service is driven by the market, demand and volume. I would not like to speculate what tiny percentage of customers would have needs matching yours, so to call this a disgrace seems to be beyond egregious on your part!.
The current Nokia ONT's aren't 10Gb either.
They are GPON ONT's with a single 1 Gb Ethernet port.
OpenReach are supplying the Nokia 7368 ISAM ONU G-010G-Q
https://wdcnet.com.br/wp-content/uploads/2020/06/Nokia_7368_ISAM_ONU_G-010G-Q_Data_Sheet_EN.pdf
As mentioned if you currently have a Huawei ONT then OpenReach won't install a
Nokia ONT.
The ONT Vendor must match the OLT Vendor in the exchange.
This isn't strictly necessary with GPON but OpenReach would lose access to vital telemetry if they mixed vendors ONT/OLT's, so they don't.
It's actually configured not to work, with many examples of engineers bringing the wrong make of ONT only to find it won't work.
@licquorice
This bit.
"Hmm, that's a good idea, convert an electrical signal to an optical signal for about 6" and then back to electrical again"
There are no optics involved in a copper SFP+ module and the link from that to the Nokia interface would be copper.