First attempt at short to long

you could handle the volume here - “if” your acceleration zone is limited. You need some volume in place to get the required Speed endurance volume in.

Set a cone out to say 10m, acc out to that, then maintain for remainder. Keep recovery’s at start fairly short and slowly increase speed (via placing marker further out slowly) as the weeks progress and your form and ability improve.

Doing too little volume and you’ll neglect the final aspects of your racing (60-100m section)

I would be looking for 1x wk earlier on doing some longer reps (perhaps 300’s and working down over the months) unless your doing so indoors and hence the split runs? Then keep to the splits. Esp if running 200’s