XF 1.5 Can I rewrite resource field url?

[rhodes]

I use RM with custom fields shown in a tab.

The url for a single item looks similar to the following:
https://mydomain.com/resoures/mycategory/one_rm_item.314/field?field=customfield

For SEO purposes I would like to rewrite the url to
https://mydomain.com/resoures/mycategory/one_rm_item/customfield

I've tried to find a solution with route filters and wildcards, but without any success.

Any ideas what I could do?