If you like the looks of the host, there is no reason not to buy it and then spend $5 for a run of the mill CREE, or a nice Nichia emitter for it.

I don’t think it makes any sense to do more than that. Even if you punt on maintaining the charging feature, the trouble and expense of fitting a driver seems like a bad investment. As for the existing driver, I doubt it is anything more than PWMed ballasted with some inline resistors to limit the current.

If you go to the trouble of opening it up, and you find that it is indeed as I guessed, you could turn it into a crummy direct-drive driver by shorting pasts the resistors. There is a risk that this will fry a low Vf emitter, but I’d guess that the stock FET doesn’t have particularly low resistance, and will probably limit the current. Unfortunately, I doubt it has great heat dissipation either, so it may cook the FET.

Really though, there are so many better options for a modding host for, at most, a few bucks more.