Halion, Groove Agent, The Grand 3 etc has standone versions for windows, so do
Retrologue, Padshop have a standalone version?
Or atleast can they all show up in Halion 7, in this area?
Unfortunately no 
Hello!
You can “create” your own standalone with this free software (donations welcome 
):
https://www.hermannseib.com/english/savihost.htm
Just make sure you use the 64bit version for VST3.
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