I think those players can still be fairly decent guys in the long run. 90s-low 100s TSP players are still valuable as they provide the depth and financial stability for your team to be able to not only get wins, but also build bankroll to buy other players in the future or improve infrastructure.
Both have the capabilities of becoming fairly solid forwards, so I would begin with training One on One (Forwards) for an entire season or even up to nearly 1.5 season to improve their handling and driving skills. Driving is a very cheap skill and can one on one help improve 4 skills at once (Jump Shooting, Inside Shooting, Driving, Handling) so it's kind of like a 4 for 1 special. With even a level 4 (advanced) trainer, you should see about 13-16 pops throughout the season on both of your players, barring injury.
After 1 season of one on one then you likely move on towards improving both of their defense. I highly suggest training Pressure (OD) Outside Defense is still a highly sought after skill on the market and it boosts teams ratings fairly quickly once trained up. OD will also rise faster due to elastic effect given from Handling skill. Mpaltakis will be solid once he hits around sensational+ Outside D. After getting their defense up you can elect what you want to train from there, as it will likely revolve the kind of identity you want to have; either playing an outside game with jump shooting, or pound the rock inside with some inside scoring. This is very small sample and this is a plan that usually goes to about 2.5 seasons to start seeing the results come to fruition.
Hope this helps!
3 Time NBBA Champion. Certified Trainer. Mentor. Have any questions? Feel free to shoot me a BB-Mail!