Change Alpha to White

Wondering if there is an easy way to change make alpha white.

Situation: I have 300 individual clips I have keyed using 3D keyer. I'd like to utilize the 'Export Individual Clips' option in Resolve to maintain the filename and export each of these keyed clips individually but instead of exporting with Alpha, I'd like the alpha area to be white.

Is there an easy way to do this either via an effect applied in the Edit tab, or somewhere in Fusion (Merge/Background etc), so that I can apply it to all of the clips?

When I export currently, with a 'Solid Color' under the timeline and use the 'export individual clips' option, Davinci doesn't factor in the white layer underneath and only renders out the keyed out portions.

Thanks in advance!

My initial thought is to make each clip a compound clip with the bottom layer being the white solid. Obviously that is taxing for 300 clips.

Also, the clips are non-sequentially named.

Individual clips will not do your compositing for you. Every clip is treated individually. (Hence the name of the option. )

You'll have to add that background to the clip in Fusion.

You could also try and add a Solid Color generator underneath each of your individual keyed clips on the Edit page and create compound clips of each pair.

You'll have to add that background to the clip in Fusion.

I think it's a good way to do.
You still have to copy fusion composition per clip (middle clic on thumbnail in fusion page)