I'm planning a return trip to LHR-DME which will be on a 787-9.

As someone who is over 6'1" and has long legs finding a comfortable seat is a must.

The exit/bulkhead row seats in WT on this aircraft seem to have bad reviews and the cost of WT+ on the outbound leg is quite a jump in price.

I was therefore thinking of Seat 43 J which is the last row and labelled as twin seats, as I could then angle my legs to the right and with the extra space between the seat and the cabin won't feel as claustrophobic.

I will be travelling solo so would I encounter any issue booking one of these so called twin seats or would i be better off paying the WY+ on both legs?

Thanks in advance of any tips