Wambacher's Boundaries Map itself allows to add a buffer if you select
the "bpoly" option.
From the Help page [1]:
bpoly - OSM polygon file with an enlarged margin (buffer). This is
sometimes advantageous during clipping.
if bpoly is selected, the size of the buffer can be entered in kilometres.
[1]
https://wambachers-osm.website/index.php/projekte/internationale-administrative-grenzen/boundaries-map-4-3-english
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