> I m under impression X5000 port would not happen, if Trevor did not sponsor it.

As far as I know, there was no "sponsoring" beside providing P5020DS development systems for initial porting and later CyrusPlus boards.

> I dont know how SAM460ex support came to be

Likewise, no sponsoring besides providing development systems. The reasoning for the port has been given by MorphOS Team members and discussed here here on MorphZone:

https://morph.zone/modules/newbb_plus/viewtopic.php?forum=3&topic_id=11037&start=205 (#206)
https://morph.zone/modules/newbb_plus/viewtopic.php?forum=3&topic_id=6805&start=89 (#90)
https://morph.zone/modules/newbb_plus/viewtopic.php?forum=3&topic_id=6805&start=99 (#100)

> my advice is to, if not too much hustle, support
> SAM 440, A1222 and even x1000

Hassle with A1222 support would be tremendous for known reasons. Just look at the performance and compatibility issues in OS4 world. It's a wise decision to stay away from it. X1000 support would have been nice, yes. Sam440 I'm rather indifferent to as performance is really low. Efika performance is even lower, but that port was paid for, which made all the difference.