Sounds good, although I'd check the price and compare your paid CW ticket with an MFU (paid WT+ upgraded with miles to CW). The question is, is the (probably considerable) extra cost of CW over WT+ worth the 90 extra TPs?

I think you'd only get 230 (80+150) TPs on a paid WT+ MFUd into CW, instead of 320 (80+240) TPs on a paid CW (assuming the short haul sector on a WT+ flight books into CE which I don't know).

Overall, it might well be cheaper for you to MFU a bought WT+ ticket for Mr FB's long haul trip, and then buy a cheap CE ticket for a weekend away somewhere, to get 80 of the missing 90 TPs.