If it is possible to have a basic trainer that doesn't require lifetime subscription to be there and as much be updated but only updates say twice a year.
No, sorry, it doesn't work that way. Once the game hits 20 trainers, all future updates will require a lifetime membership, regardless of the number of options. You can send your thanks to the game devs that seem to have no clue what they are doing or simply upload patches every time they write a few new lines of (untested) code.