Lad regarding lower levels (how low are we talking about by the way? Like conference or something?):
Indeed the roles in the tactic are nominally unsuitable for sides bellow say championship level but in reality you can fit players in and still get good performances despite your assistant nominally giving a player rubbish ratings..
I remember back on I think fm 22 or something I used a tactic with a complete forward in third bundesliga with KFC uerdingen and despite my complete forward being rated in silver stars he scored i think 25 or something goals .
Just fit your best most suitable players in the role and give it a shot or try changing some roles for instance regista to DLP and complete forward to pressing forward support or deeplying forward support.