@Newtothis -- it seemed that adding another wifi network was going to slow down or interfere with the BC.
Well, any additional traffic (from a user of the guest network) will go through the BlueCurve.
The question is whether the BlueCurve is "fast-enough" to simultaneously handle all the traffic from 2 "wired" ports and a theoretical fleet of WiFi-connected computers/tablets/smart-phones, without a NOTICEABLE slowdown in servicing each connected device. I think that it is. Only in a "laboratory" environment would ALL the computers in the "fleet" be simultaneously actively using the Internet.
However, your Internet is limited to 100 Mbits/second for "sending" packets out to the Internet. A theoretical "fleet" of connected computers could achieve that limit, probably before the BlueCurve runs out of "horsepower".
Hopefully, the WiFi "channels" used by the BlueCurve are different from the WiFi channel used by your 3rd-party router, so that there is no "collision" of signals. Compare to having two FM radios in your home. Each can listen to a different channel, without interference from the other channel.
