Improvements to Google feed VariantName recognition

Investigate transpose bespoke VariantName to a Default recognised by Google. Appears EKM Google feed provides only 4VariantName: color material pattern size. So for Products with Variants:
LOOK at Primary VARIANTNAME
IF VARIANTNAME EQUAL VARIANTYPE, then export VARIANTNAME to Feed
IF VARIANTNAME NOT EQUAL VARIANTYPE, then export VARIANTTYPE as VARIANTNAME to Feed

IF Additional Variants within Product Consider if secondary VARIANTYPEs are different TYPE or same
eg Trousers both has multiple SIZE VARIANTTYPE Will it conflict?
VARIANTNAME=Waist Size, VARIANTTYPE=SIZE - export value VARIANTNAME= VARIANTTYPE
VARIANTNAME=Leg Size, VARIANTTYPE=SIZE - leave?
Where below if different:
VARIANTNAME=Shirt Colour, VARIANTTYPE=Color- export value VARIANTNAME= VARIANTTYPE
VARIANTNAME=Shirt Size, VARIANTTYPE=SIZE- export value VARIANTNAME= VARIANTTYPE

Also can Values in feed to be pointed to VariantValue? instead of manually added Attribute Value. A product can have 4 same values in 4 columns.