By all means give it a try, but I’d be surprised if it works any better. Every time I’ve had APs on the same channel it’s just given me headaches - with the exception of where I’ve expected that, like mesh with just a couple of APs. You don’t need power injectors if you want to try it, just switch the APs to a VLAN with no DHCP server. Just be aware that because the AP is on the same channel and is broadcasting the same SSID as another, it doesn’t mean a client can connect to it. A client still has to associate to the AP before it can communicate with it, that’s no different to when the APs are on different channels. If you can then give it a try, the client may more readily associate with an AP on the same channel, than one which isn’t, so roaming may work better, but you’ll also get more interference. If the clients are old then they’re probably not using some of the newer 802.11 amendments (e.g. 802.11k),or they may just not be implemented in the client’s stack, so just see what works best for your environment.
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