Using switch as a A/B bypass controller

Hello,

Recently I am planning to add IPS as a bridge in between the router and firewall.  However, due to budget limit.  It is not allow to purchase deploy another IPS for cluster or purchase A/B bypass switch. 

I have a old switch 28xx switch onhand and I have a idea like my drawing attached.  Did you know is it possible to do so.  What any things I need to take care about this?

Thanks!

Machi