The respawn anchor should have its own structure, maybe a well? It could only spawns in the soul sand valley, and behave as an occasional checkpoint for anybody daring enough to traverse this biome. This makes sense because the soul sand valley is the only Nether biome with little glowstone, so you may need to explore other biomes in order to use it. Perhaps the structure could also be dimly lit with crying obsidian, a soul lantern (protected from ghast fire by pillars), and even have glowstone hidden under the respawn anchor. Here is an example of what it could look like:
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