Yes the sds models are only ones that are designed for simulcast. Other current Uniden models to consider depending on your budget that are less expensive, 436hp, home patrol II, 536hp all program the same way with sentinel.
The 325p2, 996p2 program with other software with freescan being the free option. Since your a premium subscriber you can use freescan with your login credentials you use here and just download the frequencies, talkgroups.
These other Unidens work anywhere from great to well depending on your location and the four towers in your county.
My 396xt - the prior version to the 325p2 current model works very good on saginaw and midland simulcast that also have four tower systems.
Link for videos how to use freescan(325p2,996p2)-
wiki.radioreference.com
Link for how to use sentinel
As with any model you do get, be sure to update the firmware from Uniden as they improve & fix many items including assistance with simulcast.