I was going to suggest Highland Village or Highland Lakes, just a couple of miles North of the West end of Lewisville.
Don’t know if the OP is going to work in East or West portion.
Many suggestions here talk about cities North of Dallas, up 75 (bad traffic and many miles away). Others suggested cities near I35W (also many miles away).
I’ve lived in Grapevine since 1986 and was a member at Denton CC in Argyle for over 20 years. In the early years, that 50 mile round trip took about 35 minutes each way. When they were widening 114, it took well over an hour each way.
In his case, up 121/SRT. I certainly wouldn't want to go past the SRT/DNT interchange every day, but lots of folks seem willing to make that commute. And Plano and Lewisville abut, so if he works down toward the Hebron end of Lewisville, and is rich, west Plano would make sense. But if he is working north, I'd go a lot further out that direction.
And if he's got kids and not home schooling, Plano and Allen would certainly move up his list (with the warning that far west Plano is Lewisville, not Plano schools. Plano also offers Prestonwood Christian and JPII as options. TCA is probably too far south and east.