I think you could still try the 3x a week, I have just seen a lot of people not handle it well and I think it can be tough to handle. You could always switch to a 2x a week if 3x proves too intense.
I would not necessarily recommend this to you, but here is what I did:
Monday–Speed + lower weights
Tuesday–Warm-up + Tempo (moved to doing general strength/medball work once weather turned poor) + Upper weights
Wednesday–Very easy/off (Warm-up/GS or Pool)
Thursday–Acceleration work + Split Runs/SE + lower weights
Friday–Warm-up + Tempo + Upper Weights
Saturday–Very easy or off
Sunday–Off
I was only able to run one 60m race and I ran a huge PB under bad circumstances (long travel, no sleep, stumble, etc.). I dropped over 3 tenths off my 60m even though this was just my opener (and only race)–I went 6.9fat…
The plan you proposed could work well and I have heard of people doing it with great success, one of whom is a coach on this forum.
I would just take more rest than you think you need. Without somebody watching your workouts, less experience, and not a lot of therapy, it is always a better idea to do a bit less than you think you COULD do.