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The H40 is already pushing the 3.4 volts needed to drive a Luminus Cube. The Cube’s forward voltage should be nearly the same as the SST-20 in practice. Manufacturers sometime list forward voltage as V (f).

You could do the same mod mentioned in another thread that makes the center pad the negative while the old negative becomes a second positive. That mod, however, may make the driver go haywire as most of those DTP paths are not fully electrically isolated. Then there’s also the forward drive current. I’m running one Cube at a max of 700 milliamps. 4 Cubes should be able to handle 2.8—2800 milliamps— amps safely.

If you wanted the next closest thing that will also fit in a 3535 footprint without the use of a filter, you can use the Cree XP-E2 PC Amber. CRI is there in the 40s, and it doesn’t render blues. Or you could use the Lee daylight to tungsten series on the SST-20 to achieve a filtered warm white LED with better CRI then the PC Amber, but more of an amber tone.

You could also use the Epileds golden yellow LED. Djozz has 4 in a BLF Q8. That has a CRI in the 60s, but it needs a 5050 footprint to work.