Well, really all newer flashcarts have the built-in auto DLDI patching.
You can go thru, say, the last ten GBAtemp reviews and go to the pro's n con's (under Conclusion) and it should include if it includes auto DLDI patch or not.
BTW, R4 got an update to where it auto DLDI patches. I don't know how recent shaunj66's review is.