Assume for the sake of argument that the Senate had voted to convict and disqualify Trump

[StarfishSaver]

16. The issue of benefits is governed by statute, not the Constitution

The Constitution is silent on this. Former presidents are provided benefits pursuant to statute, specifically 3 U.S.C. § 102

The Former Presidents Act provides that former presidents are entitled to a pension and office and travel budget. It also explicitly excludes presidents who have been removed through impeachment from receiving those benefits. All other former presidents - including those who have been impeached and convicted but not removed from office - are entitled to receive those benefits.

This is an unfortunate loophole in the law. Obviously - and not surprising, because who would have thought - the drafters did not anticipate a president being impeached while in office but convicted after leaving office and therefore not subject to removal. But that's the law. It can be amended to cover any president who is convicted, but the new version would only apply to future presidents since, once someone becomes entitled to the benefits, they cannot be revoked.

As for Secret Service protection, this is covered under a different statute, which provides lifetime protection to all former presidents, regardless how they left office.