Ive thought of the same thing HEAPS. But hot spot works just off your mobile data. It cant hot spot the wifi connection and extend it. Your router could be configered to get better range, e.g. turning N on intead of b/g. Another idea is find another router and set it up so it bounces the signal. Either way the antenna cannot recieve and send at the same time. Its a hardware limitation
may be you are right I can't use the router for my wireless devices any more but at least I need it for wired devices (which are more important to me) and for the wireless devices I can connect to my hotspot.
the problem here is that I want to know if this model of router is able to do this or this is impossible using it.
and as I said before it is a temporary situation so I only need this solution from time to time.
so is there any hint how could this be done