im about to implement chr bank switching in the mapper4 (mmc3). While implementing mmc1, i thought of using 2 patern table pointer like so:

byte patern_table[0x2000]
byte *patern_table0
byte *patern_table1

Now, i only have to do

patern_table0 = &chr_rom[bank * 0x1000]

to put the bank in place. (my ppu use the pointers to read and write data into parten tables). On a game with no mapper, i simply do

patern_table0 = patern_table;
patern_table1 = &patern_table[0x1000];

Now, with mapper 4, there is some 1k bank switching (8 different banks), so this scheme doesnt work anymore. I was thinking of splitting even more my patern table (patern_table0,1,2,3,4,5,6 and 7) but it fells wrong to me. Is this a correct and somewhat efficient method or am i going to hell with this?