New ports code on -stable

[Steve Shockley <steve_(_dot_)_shockley_(_at_)_shockley_(_dot_)_net>]

I'm working on a port (Courier-META), and once finished I plan on 
running it on a 3.6-stable machine.  However, my development machine 
(which is much faster) is running -current and I'd like to take 
advantage of the new features in the packaging tools.  I'd also like to 
avoid having to write the port twice (once for -current, once for -stable).

Will the new packaging tools work on -stable, or have there been too 
many changes?

Could I install a -stable binary package using the new tools, or would 
that break?

Could I build a -stable port using the -current tools, or has everything 
in infrastructure changed too much?

I'm trying to decide which is less trouble, writing two ports, running 
-current package tools on -stable, or chasing the moving target of 
-current on a production (home) mail server.