Pending waiting for someone that knows things for DVD firmwares and hitachis in general then you are probably going to have to grab those firmwares with nfo/changelog/update history, possibly some earlier ones (security was sometimes added over earlier stuff for no great other change), any later ones (might get away with one or two later ones if history is cumulative), any later guides to flashing, possibly some older guides to flashing (don't know if the old jungleflasher things are around).
The issues I foresee are still those two mentioned. That being XGD3 support (if you are not familiar then MS changed the disc format to claw back a bit of space and improve security a bit later into the 360 lifetime, which most subsequent games leant into, in turn needs you to either have a special burner or run a special payload onto a larger list of burners before burning) and any internal security checks being present that mean valid official discs will appear invalid to it as it was made before such disc waves became a thing and is a whitelist approach to such validations. XGD3 would be an almost certain killer on any other drive type for this little exercise but some hitachis managed to dodge needing an update for that so it would presumably follow that barring wave concerns (XGD3 also corresponds to new waves) so you might be in luck there.
Over the years there might have been other concerns and reasons to stick on other dashboards or some workarounds (it memory serves is not impossible to change a wave and still have a valid disc on DVD modded stuff, it is however a shining "ban me now" beacon that may or may not be tripped) but nothing that is in play today.
If your readings of the firmware changelogs mean you think you can pull it off, and if you can risk a ban* then maybe a test or two of the drives to see if it works.
*to my knowledge we have not seen a DVD caused ban in many years at this point -- just JTAG/RGH, dodgy credit cards and acting the fool online really. Whether they have some legacy exception I don't know as most will similarly have all been using current firmwares and ABGX360 so not like anybody would have come and told us, much less in enough numbers for a decent sample range.
You could possibly hack the hacked firmware, either to drop speeds in the latest efforts or dodge any of those hypothetical checks, but the hours required to probably even get a suitable software setup going on, never mind actually do the hacks as all that happened behind closed doors, could fund a probe.