I got surf_eygpt onto SF it worked pretty well apart from the gay textures, entities

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Eat crayons, poop rainbows!

ScoutKnives could work as an sf map...

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Retreat and I'll shoot you, coward!

scout knifes would be hella fun. Because the elevations are so different.

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Flare is a Faggot

Textures aren't so much of a problem since they can be copied over to HL2.
The entities are a different problem however that can be taken care of easily
because the entity data is stored as plain text in a paticular lump of the
BSP file so it shouldn't be too hard to change any map to work in SF.
The only issue I see may be dealing with no freeze and flag zones since those
are brush based.

It isn't hard to port maps.

Magical things like VMEX and Pakrat

Most CS:Source maps wouldn't really work for sourceforts from a gameplay perspective - uneven maps, too many tight areas. Some simpler maps could work though, and it would be fun even if just a gimmick.