Position your cursor on the title of this page in the menu items on the top of this page to see the drop-down listings for the different parts of the alphabet which list the names of Belgian and Luxemburger helpers from the index at the Textual Research Room, National Archives II, in College Park, Maryland. (The names of Luxemburger helpers are mixed in with those of the Belgians.) There are 587 pages, usually in groups of ten per website page. The readability of the names varies from page to page, apparently depending on the condition of the typewriter ribbon used by the typist. Clicking once on the image will produce a smaller version. Click a second time to get a greatly magnified version which should be easy to read. If you are searching for a helper from Luxembourg, you should also check the separate list of Luxemburg helpers. There appears to be some overlap between the two lists but not much.
Note that unlike the Dutch helper list, in the Belgian list names that begin with Van, Van der, etc. are all lumped together. By contrast, the Dutch list has them arranged by the main part of the name. For example, the name v. Altena in the Dutch list is in the A part of the alphabet, while van Altena in the Belgian list is under the Vs.
For an English-language discussion of the meaning of the Award Grade assigned to a helper, see https://www.evasioncomete.be/TxtAwards2.html. For a French-language explanation, see https://www.evasioncomete.be/TxtAwards.html. Another source for an explanation of the Award Grades is in the report on the History of the Holland Office, 6801 MIS-X Detachment, the second memo (dated 28 June 1946), pp. 7-11 on this website.
A tool that may be useful in searching for Belgian helpers is an Excel file of Belgian place names created by Dutch researcher Jaap de Boer. Place names in Belgium are complicated because they have both Flemish and French language versions. Column A of the Excel file gives the Flemish name, Column B the French name, Column C the name of the municipality, Column D the name of the province, and Column E the regional name. Click on the symbol for the Excel file to download it and use Control+Home to go to the beginning of the list: Belgian Place Names (2).