reblend 2 sets of frames sequentially

[imalmg]

I really apricate the work you've done with these nodes but I was wondering if there is a way I can use them to recombine 2 batches of images that come from the same original video.
Currently I have a video that has numbered frames 1-300, and I was able to easily split them into odd (1,3,5,7...)frames and even (2,4,6,8...)frames. But every tool that combines them either requires a manual switch, or replacement, or appends them at the end.
I want to be able to use the frame count or active frame from each batch in a comparison which then drives a Boolean that switches between source folders.