Splitting dual-band SSID in to two?

Just curious if anyone has had any experience taking a single SSID that uses both 2.4ghz and 5ghz and splitting it in to two separate SSIDs, one for 2.4 only and one for 5 only?

I'm considering this for our on-campus housing. I've got a Cisco WLC and each network is currently using Band Select. Unfortunately, there seem to be a lot of clients that still prefer 2.4ghz and then we, of course, get complaints about slow speeds or bad signal. Some times we go over there and there doesn't seem to be any issue we can see on our phones and test devices, other times we can see an issue but switching over to 5ghz instantly makes things better. Many of these residence halls have 2.4ghz interferes in the form of things like cheap and/or old microwaves.

We thought Band Select would help, and maybe it is for some devices. I've seen some though that insist on staying on 2.4ghz until you go into device settings and tell it to always prefer 5ghz. Some cheap Wal-Mart laptops only seem to come with 2.4ghz radios (ugh) but we've seen dual-band Lynksys USB wifi adapters that are cheap enough that it won't break the bank for students who want them.

What I'm considering is to just shut off 2.4ghz on the current SSIDs that everyone's devices know and create a new one for 2.4ghz with the same name except with "Legacy" or something included. My hope is that existing devices that know the current SSID will simply reconnect at 5ghz if they support it and, if they don't, the user will have a new SSID to join for 2.4ghz only. Of course I know we need to evaluate 5ghz coverage first.

I've seen this as Best Practices in a Cisco White Paper for Apple devices but I was hoping to hear from anyone on this subreddit that might have experience with this and knows if it improves anything?

Thanks!