Help with choosing a reputable professional modification service and proper modifications

What region/country are you in? In the US, the two big ones I am aware of are Spencer's Camera and LifePixel (both have the same basic options and similar prices I believe). On LifePixel's website, there is an "Education" tab in the menu banner that explains a lot about the different modification options and shows examples. I think if you just want to shoot hydrogen nebula DSO's where you want to be sensitive to red but not IR, then the Hydrogen-Alpha modification is fine - that removes the red-blocking filter but they leave or install a (visibly) clear glass filter that still blocks IR light. The full-spectrum option is more flexible if you want to do other things with it or use your own IR-block filter -  in that case, you just have to use a filter on the telescope. Depending on which telescope you want to get, usually there is somewhere to install one on the flattener or they make some that clip into most cameras.

What region/country are you in? In the US, the two big ones I am aware of are Spencer's Camera and LifePixel (both have the same basic options and similar prices I believe). On LifePixel's website, there is an "Education" tab in the menu banner that explains a lot about the different modification options and shows examples. I think if you just want to shoot hydrogen nebula DSO's where you want to be sensitive to red but not IR, then the Hydrogen-Alpha modification is fine - that removes the red-blocking filter but they leave or install a (visibly) clear glass filter that still blocks IR light. The full-spectrum option is more flexible if you want to do other things with it or use your own IR-block filter -  in that case, you just have to use a filter on the telescope. Depending on which telescope you want to get, usually there is somewhere to install one on the flattener or they make some that clip into most cameras.

@matthew.maclean   I’m in Maine. I would prefer to avoid international shipping but don’t care otherwise. What’s important is quality work price and turnaround. I found Spencer’s but didn’t see lifepixel. I will check them out and the info you recommended!  Trevor astro backyard  mentioned http://www.imaginginfinity.com/dslrmods.html which is in South Carolina and had a good price.

Other then tinkering with my camera lenses I’m going to purchase a refractor telescope which seems to be widely recommended for beginners and costs. So far I’ve been leaning towards the radian raptor 61 which has good reviews and is compatible with full frame cameras which I have. I’m open to other suggestions though.  Last a consideration I have for this camera is to be able to use it as a backup camera if my other one goes down, have the option to shoot Milky Way, and DSO. As I understand all you need are clip in filters to revert it back.  Thank you for the info!!!