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So what needs to be done to these short of drining the fluid, and replacing the filter?

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That, for the most part covers it.

As I said there are two filters, a primary, which is what most consider to be a normal filter and there is also a converter outlet filter...It looks like a small screw on oil filter.
You can use what ever you feel like on the primary, but please use a mopar for the outlet filter. There have been issues (even on the early mopar pieces) with converter drain back with that outlet filter. Current part number 5179267AC

Like I said above make sure you replace and get seated properly, the primary filter seal.

Use silicone on the pan....do not try a gasket, it WILL leak.

On those years, while you have the pan off, look up in there on the passenger side (just behind the screw on filter) on the valve body, you will see a thin metal plate bolted to the valve body (running front to rear) this is the accumulator pistons retainer. They are known to break the bolts off.
This allows the piston(s) to come out and you will lose various gears depending on what comes out. Usually reverse or 3rd is the first to go (L/R and OD accumulators on the ends)
3rd is a fun one it will take off fine, once it sees a ratio error on the 2-3 shift due to the OD clutch not being able to apply it goes to limp, Limp mode on a RFE is 3rd.....You are not going anywhere at that point

If it is flat against the body it is ok, it will be bent out if any of the bolts break.
There is a updated plate kit for this if it is broken.

Edit: one other thing, be carefull of the pan bolts, they are 6mm (8mm Head) and snap off easily, also will pull the threads out of the holes if there is silicone up in there
Rick