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Routing and Bridging multiple interface configuration help-

Hi all. Looking for some community help with the example below configuration. I know this is not a the preferred way to do it, but this just an interim network configuration until the Remote Site gets re-located and reconfigured. I'm trying to bridge and route traffic and hoping the community can offer a review of the sample configuration and/or some ideas to make this a reality. Diagram attached and configuration guess shown below.

Existing network is bridged across site-to-site private line (p-2-p) so 192.168.100.0/24 devices exist at both locations. In order to reduce bandwidth consumption across the p-2-p, the 172.20.100.0/24 devices (end user PCs and new to the environemnt) will be routed out a local Internet connection which in turn reduces the p-2-p traffic to just private network traffic for the two networks. That same network requires routing through the 192.168.100.0/24 network in order to access the private WAN connected to the 3900 router with IP 192.168.100.1.

Only applicable known commands are provided

======================================================
ROUTER 1 - 3920
ip route 172.20.100.0 255.255.255.0 192.168.100.252
ip route 0.0.0.0 0.0.0.0 192.168.100.2
ip route [insert private networks and subnet] 1.1.1.1

======================================================
ROUTER 2 - 1921
!
bridge irb
!
no ip routing
!
int s0/0/0
descrip p-2-p host leg
bridge-group 1
!
int g0/0
description LAN bridge leg to 192.168.100.0 network
bridge-group 1
!
int g0/1
shut
!
int bvi1
ip addr 192.168.100.251 255.255.255.0
! [note above ip only for remote admin purposes]
!
bridge 1 proto ieee
no bridge 1 route ip
!

======================================================
ROUTER 3 - 1921

bridge irb
!
!
int s0/0/0
description p-2-p remote leg
no ip address
bridge-group 1
!
int g0/0
description site bridge leg to 192.168.100.0 network
no ip address
bridge-group 1
!
int g0/1
description LAN leg to 172.20.100.0 network
ip address 172.20.100.1 255.255.255.0
!
int bvi1
ip address 192.168.100.252 255.255.255.0

!
!
ip route 0.0.0.0 0.0.0.0 172.20.100.2
ip route 172.20.156.0 255.255.252.0 192.168.100.1
!
bridge 1 proto ieee
bridge 1 route ip
!
======================================================