Does 'service unsupported-transceiver' still work for third-party optics on Catalyst 9300 with IOS XE Everest?

The poster asked whether anyone had used third-party optcis in a Cisco Catalyst 9300 series switch running IOS XE Everest (16.x), and specifically whether the hidden global command 'service unsupported-transceiver', long used on older Catalyst platforms to accept non-Cisco SFPs, still functions on this platform and software. No errror message or failed module was described; it was a pre-deployment question about vendor lock on the then-new Catalyst 9300.

• Hardware: Cisco Catalyst 9300
• Transceivers: unspecified third-party SFP/SFP+
• Form factor: SFP, SFP+

Symptoms / messages:

no fault reported; question about third-party optic support on Catalyst 9300 IOS XE Everest