You make it sound much more difficult problem than it actually is. Embedded lights are nothing new, every small to medium airport has hundreds of them, larger airports thousands - marking runway and taxiway centerlines. Technical characteristics, installation requirements etc have been standardized a long time ago by the International Civil Aviation Organization and it's paint-by-the-numbers now. Such lights are literally off-the-shelf products and every airport maintenance team already knows how to install and take care of them.
As you can see, embedded lights are also represented from pg 23 onwards and red "stop bar" lights can be found on pg 38. Here's a picture of them installed: https://i.imgur.com/ThNIQaw.jpg
Honeywell et al all have huge catalogues with all kinds of aerodrome lights. Here's Hughey & Phillips: https://www.hugheyandphillips.com/wp-content/uploads/2022/06...
As you can see, embedded lights are also represented from pg 23 onwards and red "stop bar" lights can be found on pg 38. Here's a picture of them installed: https://i.imgur.com/ThNIQaw.jpg