For what you are trying to do I would look for a combo headlamp/cluster dimmer switch and a matching 2 speed wiper. Something retro. That will leave you with an empty hole but I drove my 73 Challenger like that for ten years and it never bothered me. 73-76 a-body should work if you can find them cheap enough but there are probably other options out there (headlamp looks to be the same/similar to what's in the Rockauto link but you'd still need a knob/shaft) . My only concern would be things getting too crowded with the flared a-body knobs, might just have to try and see.

I have considered this too and it may work bc making an adapter would be easy . However those switches are really not much less than the E-body.

Try the classifieds here or on Forabodiesonly.com. I think it would be worth it if you could find them at a reasonable price, getting the same length shaft might be tricky and I assume you want the knobs to match.

If you just want super cheap then you are going to have to hack up the panel you have and use HELP brand/GM stuff.