Edwards formed an impressive Wales coaching triumvirate alongside Warren Gatland and Rob Howley, former Wasps rugby director and scrum-half, respectively.
The trio have all been tipped for roles on next year's Lions tour to South Africa, working alongside head coach Ian McGeechan and manager Gerald Davies.
But the WRU have now extended their Wasps connection by selecting centre Rob Hoadley as assistant coach to the under-20 team, who were Junior World Cup semi-finalists three months ago.
Hoadley, 29, is still registered as a Wasps player, and he combines playing commitments there with assisting Edwards, in addition to coaching stints at London club Ealing.
Hoadley joins a new-look Wales under-20 support staff, led by head coach Phil Davies and team manager Anthony Clement.
Gatland said: "Shaun rates Rob Hoadley incredibly highly.
"Rob is still playing a little, and he is doing some coaching with Ealing.
"If you are getting someone like Rob, then you are getting a little bit of Shaun as well."
Hoadley is part of a raft of WRU coaching appointments covering the under-20s, under-18s, sevens squad and women's rugby, while a trio of technical advisers include current Cardiff Blues boss David Young.
Former Wales and Lions centre Mark Taylor will manage the under-18s, where the assistant coaches are ex-London Irish scrum-half Darren Edwards and Wales international back-row forward Dale McIntosh.
For Davies though, he returns to rugby barely five months after parting company with Magners League side the Scarlets.
Davies, capped 46 times by Wales, said: "I am thrilled to have been given the chance to get back into top-level coaching and to be able to make a contribution to Welsh rugby again.
"I'm excited to be working with our quality youngsters, and to give them a positive experience to take back to their regions and to be able to pass on some of Warren Gatland's philosophies, mixed with my own.
"It's fantastic that young Welsh players will benefit from the likes of Rob Hoadley, who has played and coached in the Guinness Premiership, and who will no doubt develop Shaun Edwards' defensive structures at under-20 level."
Gatland added: "It's great to have someone like Phil Davies on board.
"He has achieved a huge amount in the game, and it would be a shame to lose him to Welsh rugby.
"It is important that the individuals honing and shaping our future internationals are either at the cutting edge of top-class rugby, or have experienced that level of the game.
"Communication is key.
"By working together, not only in the appointment of these coaches and managers, but throughout the season, especially with the under-20 set-up, we hope to make the transition from age grade and international sevens rugby to senior regional and international rugby as seamless as possible for players and coaches."
The age grade management teams will report to the WRU's national performance manager, Huw Wiltshire, whose team of technical advisers comprises Young (under-20 and under-18s), Colin Hillman (sevens) and Danny Wilson (skills) .
Wiltshire said: "Our common aim is to produce players for our regional and international sides.
"So to have a current regional head coach (Young) on board as a benchmark will be an added bonus for our coaches and players."