Ways to connect two routers

Hello,
We have two routers connected as shown in the diagram:
We would like to create a one-hop connection ("peering") between the two routers (over the link shown) for routing purposes (iBGP, OSPF, static routes).
What are the suggested way(s) to do it?
Method 1: We have tried creating two GRE tunnels (one for IPv4 and one for IPv6) and it works but we are having various issues (which we are still troubleshooting)
Method 2: We could create IPSec tunnels; I have not tried it.
Method 3: This is my main question here. Can we define a common VLAN on the two routers so that, by using trunk links in-between, the two interfaces (actually a new subinterface of each: R1,G0/0.x - R2,G0/1.x) can coexist "alone" on one VLAN?
Other suggested methods please?
Thanks in advance for your assistance.
Regards,
Nick

Thanks for the reply.
Here is the current setup:
{View image and zoom in to full scale for clearer reading!}
With this configuration, the tunnels seem to be working correctly, however we are still having a problem: When I switch traffic so that it uses the tunnels, netflow export from R1 to a netflow server (using nfdump/nfsen) which is located at a LAN connected to R2, is not recorded correctly; I see (on R1):
# sh ip flow export
Flow export v9 is enabled for main cache
Export source and destination details :
VRF ID : Default
Source(1) 195.251.xxx.yyy (Loopback0)
Destination(1) 195.251.xxx.xxx (9995)
Version 9 flow records
680074 flows exported in 8490 udp datagrams
0 flows failed due to lack of export packet
1579 export packets were sent up to process level
0 export packets were dropped due to no fib
0 export packets were dropped due to adjacency issues
0 export packets were dropped due to fragmentation failures
0 export packets were dropped due to encapsulation fixup failures
and I find that our traffic is not recorded correctly. (When we don't use these tunnels -but another route not shown in the diagram, which does not involve tunnels- then "export packets sent up to process level" are 0 and netflow export works correctly.)
Netflow monitoring is critical to our network, so we have to troubleshoot this, before we can use this configuration in production. (I am thinking of opening a new thread for this problem.)
Any and all suggestions will be welcome.
Nick

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