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This wasp tried to deposit (perhaps successfully) egg/s into this case moth lava for at least 26 minutes that I observed - time from first photo to last. Nearly all the probing (at least a couple of hundred attempts) was around the entrance area with no obvious success.

Adult Male, ~18mm long.

Note antennae shape & spurs, keel, 11 flagellomeres.
Different front leg shape to female, as well as posterior of course.
Lack of yellow tip isn't gender based; nor diagnostic.

Note the bent hairs on the leading edge of the forewing. This occurs in both genders.

https://www.ellura.info/Diptera-Hymenoptera.html#Bembix-vespiformis

ES05 ~8mm long, Male.
www.ellura.info/Diptera-Hymenoptera.html#Cerceris

Notice the extra abdominal segment compared with our female Cerceris sp.
7 segments for males & 6 for females.
NB: The petiole is counted as part of the abdomen.

I think this is a Cerceris sp. probably Cerceris australis. See also an earlier post of a wasp of similar appearance.

In the earlier post, I added the following comment:

Ken Walker advises that "Cerceris was revised in 1981 by Howard Evans and he recognised 47 species - the two most common were C. antipodes and C. australis."

Ken suspected this might prove to be C. australis.

Based on photos on ALA and elsewhere, I also think that this is probably C. australis.

The photos of this and the one in earlier observation were all taken on the same day and location on the same plant, a silk pod vine.