Cymro

How about 360 TP for £1,239?

BCN - DXB with a Saturday night stopover of three hours, i.e., a same-plane turnaround and lots of sleeping on the plane.

You'd have to do a connecting flight out on the Friday night beforehand (10TP) and you'd have plenty of time to fly back from Barcelona in CE (40TP).

ETA: MXP and OSL are cheaper, but not massively so.

QR can do CPH - DXB for £1,358 in J on the CPH - DOH leg and in A on DOH-DXB for a total of 400TP, excluding positioning.

Or you could do a same-evening turnaround to AMS or DUB without giving up a weekend, add that to the existing booking, and/or nest an AY business fare within your HEL visit for the remaining 80 TP, with a domestic one-way and a road trip back at some other time.