Won't work that way for Pro Tools by itself.
However, you can stripe smpte on track 8 of the Fostex, run the smpte line direct into your pt interface and then set pt to slave to smpte. Fostex would be master. No midiizer in the loop at all.
If your interface or pt version won't slave to smpte ....ie...let's say it only slaves to mtc....the midiizer could be integrated (possibly) as a smpte-to-mtc point.....you still wouldn't be using any mts1000 controls...it would just be a blind converter (similar to jl cooper pps).
On the other other hand, if your pt rig only slaves to wordclock etc, you'd be looking at adding, say an old motu digital timepiece to receive smpte from the Fostex to then convert to the necessary wordclock etc that your pt wants to see.
Now, if you ever decide to use the midiizer to synchronize the Fostex to a second tape machine (and make no mistake, Fostex must be the master)....be v-e-r-y sure the second machine you buy is a Tascam of some sort that specifically....specifically.....has an acc2 port on the back and ext sync knob on the front. That's the only way you can have the second machine (the Tascam) chaselock as slave to the Fostex via mts1000.
Let's say you wanted to have Fostex as master.....slave an a824 to it....via mts1000. It can be done. Even having Pro Tools slave to all that.
But in that scenario (which I've done years ago 8516b as master/824 as slave), you're now talking adding an if1000, two custom-wired umbilical cables for communication, an insane amount of time to get it to work....etc.
And...as a spinoff to spinoff....you could..with Fostex schematics, theoretically wire up umbilicals for tandem if1000/mts1000 units to get tach/position info from the Fostex to then help the midiizer tell a Studer to "chase" anytime the Fostex goes into ff or rew......but to do this kind of wiring circa 2022....for such limited capability....is just too crazy to get into unless someone was just doing it for the geek factor
A long post.....just to give a glimpse of the variables.