The front solar filter will reject enough heat for you to safely use the scope outside all day. The drive electronics might not appreciate a lot of direct sunlight though -I cover mine and the camera with alfoil to shade them.
Sadly, unless your h-alpha filter is a solar observing one with a passband less than .7 angstrom, it will not do a lot for solar viewing, and should certainly not be used without the front filter. These filters are not something that can be screwed onto an eyepiece.
Cheers,
Andrew.
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