I'd leave it as it is until you get the new drivers in. You don't know how it will sound with both different drivers and your amp. Wait, see how it sounds and then make a choice. At least it's something you can probably test out with a crocodile clip link, so it doesn't need to be permanent (or even add a switch to select it in or out).

Does the mod shift the crossover frequency upwards or downwards? You need to be careful with shifting it downwards too far, as that passes a lot more energy to the HF driver. No idea what it's rated at but they normally aren't that highly rated. They don't need to be with a 3.5kHz crossover, but the lower the crossover frequency, the more energy they have to cope with.