Slow Motion Replays

I know there's a lot of talk about using CasparCG as a slowmo server/client but most of the chatter seems to be from pre-2015.

I am currently looking into active projects that would help support my needs for a cost-effective EVS style slow motion replay for a sports show I run.

I've come across , but development seems to have slowed (no pun intended) due to the main man switching jobs a couple of years ago.

What are your recommendations on current or past projects for slowmo replay?

My setup includes a BM Decklink Duo 2. Channel 1 & 2 I'd still like to use for Key/Fill graphics into my Atem 1M/e, but 3 and 4 are currently available for a single input and a single output for replay.

Any advice would be greatly received!!!