Welcome to the forum. You may want to check out some auto body shops and see what they recommend. May have to put on a machine and stretch/align it a bit.
Check these out:
2005 Toyota Highlander Service & Repair Manual Software (emanualonline.com)
Toyota Highlander (2001 - 2007) Chilton | Haynes Manuals
Toyota Highlander 2005 Owner's Manual PDF (onlinerepairmanuals.com)
I looked at this "oil filter conversion" a few years ago for the wife's RAV4 and my Tundra. Decided not to convert over since I have no issues messing with a canister type of filter. The cost is kind of steep, but looks like a good quality product. Keep us posted on whether you go for it.
May be a challenge on some parts. But between Ebay, junkyards, and some online searching - you should be able to track down what you may need. There is also the option of finding a donor truck for needed parts.