Hi John.

I believe the answer on both accounts is yes.

Here's my white 1680 from 1978 with replacement SuperLuminova (SL) dial.



Note that the dial is still marked "SWISS-T<25". They probably used an older batch of dials originally intended for tritium, and reconditioned it to SL to service watches. Later, when those ran out, they produced the same matte dials with SL indexes but marked them "SWISS".

Like in this (beautiful) example by Mike950:



Or this one from Harold Richardson:



The models you can get replacement matte dials painted with SL are: 1016, 5512, 1655, 1665, 1675, 1680.

Interestingly, it looks like Rolex does also propose this for Red Submariners when they service them.

Take a look at the following link.

Now, the really hard thing would be to get your original red dial back: when they replace parts, Rolex SC do it on a exchange basis and are now adamant that they keep the old parts.

Personally, I wouldn't fiddle with a red Sub, given the price they are at these days. White Sub, no issue, I prefer the functionality of SL anyways, unless the patina of the tritium is of a beautiful and even eggshell tone.

Hope this helps.

Boris