Hopefully this does the trick for you, there is not that exact language that you would like to simply cite but the below language should put the SS rep on the right track.
Under "If you are eligible for retirement benefits on your own record" at: https://www.socialsecurity.gov/planners/survivors/ifyou5.html#&a0=1
"If you receive benefits as a widow or widower or as a surviving divorced spouse, you can switch to your own retirement benefit as early as age 62. This assumes you are eligible for retirement benefits and your retirement rate is higher than your rate as a widow, widower or surviving divorced spouse.
In many cases, a widow or widower can begin receiving one benefit at a reduced rate and then, at full retirement age, switch to the other benefit at an unreduced rate."
“A widow(er) or surviving divorced spouse may wish to exclude a reduced RIB from the scope of the application and defer filing for an unreduced RIB because of the increasingly greater amount payable after FRA because of DRCs,” and that in order to do so the Social Security office needs to take get a statement such as “I do not wish this application to be considered an application for reduced benefits on my own record.”
This is the policy that allows you to restrict your retirement benefits while taking your survivor benefit (it is the policy you already linked). But it should work in reverse as well.
"Where a correct termination of WIB occurs before FRA and the individual is again entitled to WIB, on the same earnings record, months of non-entitlement are eliminated from the RF at age 62 and/or FRA. For example, an individual files for WIB on her husband’s earnings record at age 60. At age 62, she files for higher RIB on her own earnings record, which causes her WIB to be terminated because her own RIB PIA is higher than her WIB on her husband’s earnings record. At FRA, she files for WIB again on her husband’s earnings record and receives an ARF for the months in which she was terminated due to higher RIB entitlement."
This shows that you can elect to take your retirement benefit at age 62 and then elect to take you widow's benefit at age 66. The situation is a bit different than you describe as the retirement benefit is higher than the widow benefit at age 62 and then the widow's benefit is higher at age 66. It does show that it is possible.
"The SSA-10-BK serves as an application for all benefits to which the widow(er) or surviving divorced spouse could become entitled within the effective life of the application, including the LSDP, RIB, survivors' benefits under the Railroad Act and Department of Veterans Affairs payments. When a widow(er) is eligible for WIB on more than one record but does not restrict the application to one record, see RS 00615.301A.1. The application must be restricted to allow the widow(er) to apply for a higher benefit subsequently payable on the other record because of lesser reduction for age.
NOTE: For more information on the validity and scope of an iClaim Medicare-only application, see GN 00204.059K.2."
This also allows the widow to restrict her benefits if she is eligible for benefits on more than 1 record before FRA. These links and language should give you enough info to be dangerous when you speak to the next rep from SS. What you want to do is possible and can be done. It is called "claim and file" and is just not used or taken advantage of much.
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