Have you seen the Osprey book 'Teutonic Knight'? The cover illustration shows a raiding party and the text mentions that it depicts a temporary volunteer from England. The armour is based on the effigy of William de Keynes although the livery actually looks like that of the Harcourt family. I'm not sure if either Keynes or Harcourt ever travelled to the Baltics but I'll keep looking.
http://www.themcs.org/churches/Dodford%20St%20Mary%20the%20Virgin.html
Thanks.
Sir William de Keynes from Dodford aka William de Cahaignes /Caines ? If so, the Family had a history of crusading. Richard de Cahaignes died 1270 in the Crusades but I can´t find much more about them. The colours on the Knight on the front cover also Looks like those of Brian le FitzAleyn

The Knights of st Thomas. I wasn´t familiar with them....and after doing a bit of searching, this wiki link quote....
However the financial situation continued to deteriorate with reports of the London premises being reported as being in ruins by 1330 and the order ceased to be a viable military organisation with nothing more being heard of the master in Nicosia after 1360.
...seems to be true. Unfortunately they seem to run out of steam around the time I´m looking for..

So far I´ve come across names of english kniggits who took part in Baltic reysas but Thomas Ufford, Thomas Holland, William Lord of hastings but all well after 1330.
I´m beggining to think there might not have been many (or not titeled ones) due to the Situation in England. The scotts, French and Mortimer..but maybe some could have been refugees from Mortimers time?
I´m having a bad time of finding and confirming the list of named German Knights as it is...

..12 so far from 30 plus.