Before giving up, well worth talking to a local electrician. You appear to know where you want the cables, just get them to sort the cabling and, potentially, the speaker cut-outs as well. A lot of electricians are very inventive in getting cabling in place and are experienced in cutting holes for downlights.

808v6, M60, MC200, HD621, Lumagen XE, 504, SB Touch, 563, 201, 204, 208, MPMAX 221, M80, Explorer, Explorer2.