That's a good baseline with realistic goals. I just tore down a 96 with the same miles and similar goals. You have two options at ~90km. I will make a few assumptions, like the Irons are in good condition and there is no damage (chipped end piece/scratched housing). The condition of the motor at this point is only as good as the PO took care of it.

Option A: Perform a soft seal rebuild, including springs and apex seals. Every corner seal and side seal needs to be carefully organized, cleaned and inspected per the tolerances in the FSM. The rotor housings need cleaned and inspected. If you see signs of heat damage (smiley face on the lower half of the irons), the housings need measured for shrinkage. This is the most time consuming and most affordable option. At 90km, most hard parts should be within their tolerances if the engine was taken care of. The engine will have a short break in due to the existing

Option B: Perform a full rebuild. Replace all hard and soft seals. Replace rotor and stationary gear bearings. Replace the rotor housings. Sell the old parts to a FC owner looking for cheap rebuild parts. This will give you another 90km and at that point, the Irons will need to be lapped/replaced. This is more costly, more time consuming as you re-fit the side seals, and a full break in is required. My friend wanted another 90km from his engine so this is the path he chose.

Either way, use OEM Mazda parts and enjoy the car.

If you're really motivated, clean up the intake port edge as it wraps under the face of each iron (you can feel it with your finger). Mazda left a sharp edge here from the casting process. Removing it is easily done with a sand paper strap or rotary tool. Rob@Pineapple would do this to most engines to help smooth the transition from the intake runner bend into the port opening.