routing, pf, rdr question

[giuliano]

Hello,
I'm trying to replace our current firewall (clavister) with freebsd/pf. 
I'm almost done but I have some rules I don't know how to convert. I've 
tried googling around but I've found nothing useful (maybe I'm looking 
for the wrong terms).

I have the following scenario:

LAN (192.168.1.0/24) connected to fxp0 (192.168.1.1)
DMZ1 (10.0.1.0/24) connected to dc0 (10.0.1.1)
DMZ2 (10.0.2.0/24) connected to dc1 (10.0.2.1)
DMZ3 (10.0.3.0/24) connected to dc2 (10.0.3.1)
DMZ4 (10.0.4.0/24) connected to dc3 (10.0.4.1)

The internet is accessible through another router on the LAN 
(192.168.1.254). The same router provides connections to a remote office 
using a VPN tunnel. On the remote site there are other 4 DMZ with the 
same network setup of DMZ1-4.
The PCs on the LAN have their default gateway set to the 192.168.1.254 
router so when they try to reach any 10.0.x.x IP address they connect to 
the remote site. This is correct because the production servers are in 
the remote site and only a few people use the local DMZs that are for 
development/testing.
To actually reach the local DMZs I've configured the clavister firewall 
to route all the requests for network 10.10.1.0/24 to local 10.0.1.0/24 
(and the same with the other 3 DMZs) and setup some static routes on the 
default gateway.

Can I do the same with pf without having one rdr rule for every DMZ's 
host ?
Do I have to setup an alias on the LAN connected interface for every IP 
on the networks 10.10.1-4.0/24 ?
Is there a better way to have a similar setup ?
Maybe I can modify the destination IP during the routing process (ie: 
10.10.1.10 -> 10.0.1.10, 10.10.2.53 -> 10.0.2.53, and so on) ?

Thanks for your help

giuliano