Can you breakout QSFP28 into 4 x SFP+ ports?

We have some new switches we're testing that have 32 x 100Gbps (QSFP28) ports

However, we still have a bunch of legacy equipment that uses 10Gbase-LR, with SFP+ optics.

We could get a separate ToR switch just for them, but it'd be easier if we could integrate all into the one switch.

What's the easiest way of breaking out each QSFP28 port, such that we can use our existing SFP+ optics/fiber?

I do believe each QSFP28 port can be split into 4 x SFP28 - which is backwards compatible with SFP+, right?

However, I can't actually find any adapters that do the breakout. All I can see are DAC cables with QSFP28 on one end, and 4 x SFP+ on the oehter, which is not what we want.

Ideally, we want to break out each QSFP28 into 4 x SFP28/SFP+ slots into which we can insert our existing SFP+ optics.

Does such a thing exist?