Just a quick reply, Nelson.
The Buquor adapter as used by KNIL was a small carriage that carried the whole gun when travelling, it was not a modification of the gun carriage. A unique picture can be found on this page:
It's possible that closer to the war some Krupp 75mm field guns were indeed adapted in a Martin Parry like fashion, but there is little info. I know only one vague picture of a 7,5cm Veld on Java in service with Dutch troops in 1947, but when the conversion was made is not clear.
The Dutch army at home had motorised just 16 7 Velds (these were slightly different ones from the KNIL version) of the Korps Rijdende Artillerie. Some pics can be found. I dont know if it is a Martin Parry conversion, you tell me:)
and scroll a bit down