Work with what you've got, not what you hoped it would have. I'd probably go with an base mounted dock with built in SSD anyhow (whenever they come out).Great use for a Thunderbolt 4 port, though admittedly a rear 3.5mm output would have kept it free for high speed SSDs and 5K monitors.
All 5k monitors that I know of have additional USB-C ports anyhow, so you can always plug speakers in there instead. There is plenty of I/O options once you take that into consideration.
Front mounted 3.5mm jack makes more sense for most people working with headphones/headsets.