This doesn't account for any dividends from the funds, nor from the money that I would earn on the CDs etc, just to keep the question simple.
What would you be doing - selling and reinvesting, or hold and hope?
I don't think you can turn this into a simple question & it be still be meaningful. There is a wide variation in bond funds -- credit quality, duration, style, etc. Each attribute will affect the answer.
Are you saying assume that you are NOT reinvesting fund distributions? They are often/usually the larger component of total return. There are rules of thumb for projecting fund return under certain assumptions; but these assumptions are critical & quite possibly not found in todays environment. For example, it may assume a "steady" rise in rates over time. There also may be impacts from having an inverted yield curve. They also likely assume the fund keeps a constant duration -- which not all funds do. Some will say the fund will return the initial yield if held for the same time as the duration; others twice the duration! In all honesty. no one knows the extent to which your assumptions will play out over the next 7.5 years.
I would suggest also that you consider your goal to not be "recover nominal amount of dollars in bonds", but rather maximize overall portfolio with acceptable risk. Might start with going back to see what your portfolio performance would be for the same time period if you had more in stocks. If you currently rebalance, consider impact of that also. For example, having a 5 year CD of sufficient size might constrain your ability to rebalance.
Matters little what I would do, but I'm not trying to duck that. I'm not a fan of locking in real return losses. However, since you are already in the funds, I would at most gradually shift some from longer term bonds into short term and/or "cash" (what that actually is varies between investors). Laddering 3 or 6 month treasuries might make sense as a transition. Decide upfront your criteria for "restoring" your aa. Also consider how you plan to do RMDs -- in kind transfer, cash out in advance, etc.
Lastly, don't lose sight of the sleep well at night factor!