Hi @DadofDuke, welcome to the HummerChat forums! I noticed you joined 2 weeks back and are now posting for the first time, glad to have you here.
I'm not super well-versed on the reservation process (I'm holding off for an SUV version down the line as opposed to a truck variant), but I can say that it's not out of line to ask the question. Where there may be an issue is with transferring the reservations from a member to yourself...I'm sure someone would take the $100 for it, but they also had to select a dealership to initiate the process, so that dealership may not be changeable. We'd have to wait for a reservation holder to see this thread and respond for confirmation.
Assuming it is doable, if you can't find an interested party here, you should definitely check out our sister Facebook page, GMC HUMMER EV Group. Typically we send members from there to here, but since there are about 4 times as many people there as there are here, you may have better luck finding a seller.
Also, member Rip2tide2 had a similar inquiry as you a couple months back...and if you were willing to wait, there are still plenty of EV3X reservation slots open. For reference, the EV3X slots just below the Edition One, has almost all of the cool offroad hardware and most of the software (which will likely become available as an OTA update down the line anyways), and will come a year later, in the Fall of 2022. If you can't grab an Edition One reservation, that's not a bad fall back plan by any means. In fact, the only real negative is an extra year of waiting, and that may be pushed up anyways. You also have the option to get on the Edition One waiting list with an EV3X reservation.
Hope this helps a bit.