Three weeks off isn't too bad at all. Work capacity will be a little off. However I would take advantage of the deconditioning in the same way that is prescribed in a program like HST. Give yourself several opportunities for adaptation buy taking time to move up from about an RPE7 and adding a little more resistance each session gradually instead of trying to get back to normal numbers quickly. It will allow your physique to adapt more than if you just try to get to your numbers quickly. One is ego lifting, and the other is paying attention to getting the most out of your work. Since you are not a strength athlete I would go for creating more physique adaptation than CNS/strength.
If you want a basic HST full body layout I know where a few are, or you can just use small incremental increases over about a 6 week period where on the 6th week you are reaching or just passing your previous numbers. It will allow you to get the most out of working up without killing your joints or messing with CNS too much.