Hi Steve, well I admit I don't fully understand what you are looking for... add-ons, etc. for OS 3.1??
You may have some trouble getting utilities, etc. from say, Aminet, to your Amiga. You should try to get a CD-ROM or hack one onto your 1200.
Some ideas, I don't know what classic Amiga 'lite' is, I assume that you are running just a basic OS3.1 setup, with bland-looking icons, and grey background??
OK, if so, check out programs like ReqAttack, RandWBPatt, MCP (warning: not for newbies...)
Some other A.org members can help better...
Oh, BTW, the 1702 will handle amiga hi-res modes as well as interlace, and PAL with a bit of fiddling... just no double hi-res, Productivity, etc...
(I have 1702's hooked up to my 2 A4000's (have an Amiga monitor shortage, ATM)