I'd just build up the height of the front post with a substantial bead of white paint. For 100 yards that's OK as the factory front post is very narrow and at best poorly visible in lower light on a dark background. Or epoxy on a piece of green nylon string along the top of the post for TruGlo effect.
Note that, the No. 4 shoots a bit lower with its bayonet attached. The 300/600 yard flip sight was actually designed so that when the sight was set to 300 a soldier could "engage targets up to 300 yards with the bayonet attached" Anyway, don't go hunting with bayonet attached, you'd look a real dork. Blob of paint is more discrete and useful. Also the "up to 300" applies to military shooting in which the target is a vertical head/torso/legs, but quadriped deer and goats have horizontal torsos which leaves less vertical margin of error.
I'd spend spare cash on a 'sniper'/cheek pad for non-strained shooting position. Helps with iron sights too, not just telescopic sights. If you are not sure about this, do some sustained dry firing practice on the living room floor for 20 minutes and if by then you feel strain in the back of your neck, then a cheek pad will be useful to you. The wooden reproductions will look best, but you can get velcro ones too.
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