Corollary to the most recent comment!
A security is considered "overbought" if the %R is better than -20. Therefore, today's closing price (or the next two, for that matter) would need to fall under $7879.77 for BTC to no longer be considered "overbought."
Let's say that happens. Bitcoin would be still well above the upper bound of my pink trendline, which is at $7683.09 for today's candle. Therefore, the %R-based regression doesn't necessarily threaten the trendline channel.
As I said in my OP, "The spike from early yesterday may be an illusion, but a sustained increase won't be." Even if a modest bit of regression occurs to get the %R back to normality, it's looking more and more like Bitcoin has sustained the increase from the 12th.
Put this into context of recent news headlines about institutional money entering crypto and favorably analyzing Bitcoin, and I'd say there's a lot of reason to feel good about Bitcoin's near future.