One option might be to do the tag transformations in the data file before running OsmAndMapCreator.
You can do tag transforms with osmosis:
https://github.com/SomeoneElseOSM/SomeoneElse-style/blob/osmosis/update_render.sh#L203
or with osm-tags-transform:
https://github.com/SomeoneElseOSM/SomeoneElse-style/blob/master/update_render.sh#L203
You can get osm-tags-transform from here:
https://github.com/osmcode/osm-tags-transform
Those example transformations are of names in different languages; obviously you’d want to look at “highway” tags.